Modern building envelopes are increasingly complex due to higher performance demands, tighter codes and layered assemblies. Complexity alone does not create risk, but uncoordinated systems do.

This blog post explores how uncoordinated systems can compromise an envelope and why a single-source envelope system is a better, more strategic decision.

Where Envelope Risk Typically Begins

So, what exactly is an “uncoordinated system”? An uncoordinated system is an envelope comprised of products and solutions from different manufacturers, pieced together in an attempt to create a unified system. The problem is that those products and solutions weren’t designed to work together. Even in a best-case scenario, there will be gaps in your envelope.

Gaps at transitions are only one potential issue. These piecemeal solutions often increase coordination challenges and liability. Other common failure points in multi-manufacturer assemblies include:

• Incompatible materials
• Unclear responsibility for transitions
• Conflicting installation requirements
• Warranty gaps

So, what’s the solution? Simplicity via single-source envelope systems.

What “Single-Source” Really Means

A single-source system is a system where components have been engineered to work together, and there is verified compatibility across all control layers. Integrated components reduce coordination challenges, improve performance reliability and limit long-term risk. At the highest level, single-source envelope systems are a practical risk-reduction strategy. And if anything goes wrong, there is zero confusion about which product manufacturer is responsible.

Many may think there must be drawbacks, such as sacrificing design flexibility. But there really aren’t any drawbacks. Single-source envelope systems simplify design (and can even enhance design freedom), reduce risk and improve long-term performance.

Sto’s Unified Envelope System Approach

Sto’s integrated approach includes proven technology such as StoGuard^® air and water-resistive barriers (AWRBs) and StoVentec^® rainscreen systems, and EIFS continuous insulation solutions with StoTherm^® ci, including noncombustible options. Plus, we offer field applied and prefabricated solutions, all with system harmony across all air, water, thermal and durability control layers.

These systems simplify design and specification with:

• Specification development
• Detail coordination
• Submittal review
• Reduced need for field-level problem solving due to tested assemblies

Benefits for contractors and installers include:

• Fewer incompatible materials onsite
• Clear sequencing and installation guidance
• Reduced rework and schedule disruption
• Trained application and consistent system execution

And for architects and designers, Sto provides flexibility without fragmentation. Our systems support multiple cladding types within a single envelope strategy and deliver design-driven aesthetics with consistent performance.

Why Simplicity Matters More as Codes Get Stricter

The simplicity of a unified system ensures continuity across transitions and penetrations, improving durability and long-term performance. But simplicity is important for other reasons as well. As building codes get stricter, simplicity will be key. Here’s why:

• Increasing performance and fire code requirements raise the stakes
• Simpler, tested systems reduce compliance risk
• Early collaboration ensures performance goals are achieved without overcomplication
• Simplicity is easier to maintain and adapt as requirements change

Simplicity as a Strategy

Clearly, simplicity is a strategic advantage in envelope design. Single-source envelope systems reduce risk, clarify responsibility and make high-performance buildings easier to design, build and maintain.

Sto has been a longtime champion of the system approach. We encourage you to prioritize coordination and accountability from the start and discover the power of simplicity.

We invite you to engage Sto early to simplify envelope design and reduce project risk. To learn more or request a project-specific consultation, explore our Wall Selector, contact us online or call 800-221-2397.

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You may have heard the catch-all term “pressure-equalized rainscreen” used as a standard generic description for all rainscreens. Unfortunately, it isn’t that easy. Performance depends on design intent, exposure conditions and system execution—not labels. With this in mind, there are two general types of rainscreens that differ in execution, risk and durability: drained, back-ventilated rainscreens and pressure-equalized rainscreens. In this blog post, we examine both, highlighting the key differences and the pros and cons of each.

The Purpose of Rainscreen Systems

Before we zoom in on the differences between the two types of rainscreens, let’s zoom out for a second and review why rainscreens are so important. As mentioned earlier, rainscreens reduce moisture and enhance durability and energy efficiency. But how do they do this?

A rainscreen cavity serves as a crucial differentiator, creating a ventilated drainage gap between the outer cladding and the building’s weather-resistive barrier (WRB). This design achieves several things, including:

• Manages bulk water
• Controls air pressure differentials
• Supports drying and moisture resilience
• Reduces hydrostatic pressure
• Prevents rot, mold and corrosion, and protects the building’s inner structure

Now that we’ve established the purpose of the rainscreen, let’s peel back the layers and take a closer look at the different types.

What Is a Drained and Back-Ventilated Rainscreen?

First, let’s cover the drained and back-ventilated rainscreens. These systems are intended to allow bulk water in (especially if they are open joint systems); they must therefore allow for the water to drain and dry out. Additionally, instead of full pressure neutralization, there is pressure moderation.

The benefits of drained and back-ventilated rainscreens include:

• Robust moisture management in real-world conditions
• Greater tolerance for construction variability
• Effective across a wide range of climates and building types

Our StoVentec^® rainscreen systems, specifically designed as drained, back-ventilated rainscreens for high-performance wall assemblies, provide the necessary channels for air movement and water drainage behind the cladding. They incorporate insulation, an air/moisture barrier and a framework to create a complete, energy-efficient and weather-resistant facade system. Plus, you get a range of options from thin masonry veneer cladding, versatile fiber cement, traditional textured finishes, and even brilliant back-painted glass cladding that allows for full-color HD digitally printed glass for a truly one-of-a-kind building facade.

What Is a Pressure-Equalized Rainscreen?

The theory behind the pressure-equalized rainscreen is to balance air pressure in the cavity behind the cladding with the outside wind pressure. A pressure-equalized rainscreen is designed so that wind pressure outside the cladding is equalized with the pressure inside the cavity. This prevents the wind from “pushing” water through joints and cracks. Minimizing pressure differences prevents water from being drawn into the cladding, allowing gravity and drainage to manage it effectively, even in high-wind conditions such as hurricanes.

The benefits of the pressure-equalized rainscreen include:

• Can reduce wind-driven rain intrusion when properly designed and executed
• May support thermal performance goals in tightly controlled assemblies
• Potential for long-term durability when airtightness and compartmentalization are maintained over time

Because of these dependencies, true pressure-equalized performance can be difficult to achieve consistently across typical construction environments.

At-a-Glance Performance Tradeoffs

The following comparison reflects general performance tendencies based on design intent and execution complexity. It is not a design guide or a guarantee of performance.

Climate, Height and Exposure Considerations

Choosing the right rainscreen for your project depends on several variables. Climate, height and exposure are three critical factors.

Scenarios where drained and back-ventilated systems are typically preferred:

• Mixed-humid, coastal or variable climates
• Retrofit and recladding projects
• Projects prioritizing durability and drying capacity

Scenarios where pressure-equalized design principles may be appropriate, typically limited to projects with stringent quality control and long-term maintenance strategies.

• Tall buildings with extreme wind exposure
• Highly controlled construction environments

Regardless of the rainscreen system your project requires, Sto can provide project-specific recommendations. We also provide engineering guidance for the installation of our tested rainscreen assemblies to ensure long-term performance.

Why System Design Matters More Than Terminology

To fully realize the benefits of any rainscreen system, it must be part of a systemized assembly. Material-only approaches create a piecemeal solution that inevitably results in gaps between incompatible products. in most real-world applications, durability, drying capacity and tolerance for construction variability are more reliable predictors for long-term performance than theoretical pressure neutralization.

Sto designs for how buildings are built, exposed and maintained as a systemized approach, reducing risks and improving durability. Our integrated components are designed to work together under real-world conditions. And our tested assemblies reduce uncertainty.

Critical Factors for Maximum Rainscreen Performance:

• Continuity of the air and water-resistive barrier
• Proper cavity design
• Compatible materials and detailing

Sto’s integrated approach includes proven technology such as StoGuard AWRBs and StoVentec rainscreen systems. Plus, we offer continuous insulation and noncombustible options. And our comprehensive, systematized approach means one manufacturer, coordinated responsibility and reduced risk.

Selecting the Right Rainscreen for Performance Longevity

As you’ve seen, rainscreens are not all the same. Both drained and back-ventilated rainscreens and pressure-equalized systems have value when properly applied. To effectively select the right rainscreen for your application, evaluate project conditions, not trends or shorthand terminology.

Sto is a trusted building science authority focused on real-world performance. We invite you to consult Sto’s team for project-specific rainscreen guidance. To learn more or request a project-specific consultation, explore our Wall Selector, or contact us online or call 800-221-2397.

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Yes, partner is an overused word. So, what does it really mean to be a trusted design partner? It means we provide you with the technical support and tools you need to deliver integrated, performance-driven solutions for your clients, while giving you and your team creative freedom. While most manufacturers point you to product literature or their website, Sto gets in the trenches with you. To strategize. To solve. And to create.

Early Engagement is the Key to Success

So, when should you engage Sto on a project? The earlier, the better. We have a wide portfolio of systems to choose from—from EIFS and stucco to rainscreens and prefabricated panels—so there are many possibilities. By understanding the client’s goals, the project challenges and your vision, we can help you zero in on the products and systems that will work best for your project. After all, every successful building envelope begins with understanding the project’s performance priorities, lifecycle goals and environmental context.

Those are just a few of the initial considerations. There are plenty more, and we’re here to help you sort through them.

Key Factors to Selecting the Right System

Sto has numerous advanced tools to help architects. There’s the Sto Wall Selector, the Aesthetic+Product Selector and our Documentation Center, to name a few. These tools simplify the exploration process. Our technical team often points to the Sto Wall Selector as the starting point, as it outlines essential factors every architect should assess when selecting materials and systems for their project. These are a few of those factors.

Timeline

• Project schedules often dictate system choice—prefabrication (Sto Panel) or fast-installing systems (StoPowerwall, StoVentec) can accelerate timelines.
• Early coordination with Sto Representatives ensures constructability reviews and compatible detailing are resolved before construction.

Budget

• Sto systems provide scalable solutions to meet budget constraints without compromising quality.
• Prefabricated Sto Panel Technology reduces onsite labor costs and weather delays.
• StoGuard integrated AWRB systems cut rework costs by simplifying moisture protection across multiple trades.

Performance Requirements

• Define thermal, air and moisture performance targets at the outset.
• Sto’s engineered systems—StoTherm ci, StoVentec, StoPowerwall—are designed and tested to meet energy, durability and fire performance standards, including Sto HVHZ systems.

Maintenance Considerations

• Sto coatings and finishes provide long-term protection with low maintenance requirements.
• Specify StoColor^® coatings and finishes engineered for UV stability, water repellency and dirt resistance to extend facade lifespan.

The Beauty of a Comprehensive System from One Manufacturer

Sto believes in a system approach to wall solutions. Mixing materials and products that weren’t designed to work together and that may be incompatible increases the risk of exposure to air and wind, the enemies of thermal control.

Tested for impact, weathering and aging, Sto integrated systems ensure long-term building resilience. But there are many other benefits of our system approach.

• Continuous AWRBs like StoGuard and StoShield SA help prevent water intrusion and uncontrolled air leakage.
• Proper drainage and ventilation within StoVentec rainscreen systems manage moisture and extend wall life.
• Available dew point and hygrothermal analysis ensure design performance across climates.
• Vapor-permeable and impermeable AWRBs suitable for any climate, from humid coastal zones to cold continental regions.
• Sto’s HVHZ systems include various types of cladding systems that meet Miami-Dade’s NOA or Florida Building Product approval.
• Sto systems are tested to meet stringent fire and code compliance requirements, including NFPA 285 assemblies.
• Sto Fireblocking meets the country’s most stringent fire codes, including New York City 2022 Building Code.

Flexibility, Sustainability and Design Freedom

Our products contribute to sustainable design through material efficiency, durability and improved building performance. And our systems support LEED and green-building goals by enhancing energy efficiency and reducing lifecycle maintenance costs. Prefabrication options also reduce onsite waste and carbon emissions. Our systems also deliver design freedom for designers and architects.

Our solutions support nearly unlimited design freedom—textures, colors and materials that achieve creative visions without sacrificing performance. From StoSignature finishes to StoVentec facades, architects can combine aesthetics and performance in a single system. Plus, Sto’s systems are engineered to integrate with a wide range of claddings, substrates and structural assemblies, allowing the seamless use of a variety of facade materials and giving you the ability to create one-of-a-kind designs that look as good as they perform.

A Powerful Partnership

Every project is unique, but Sto provides the systems, tools and technical expertise to help architects build with confidence and creativity. We are your trusted partner–in every sense of the word!

So, engage with our team early. And if you want to explore some of our design tools in advance, log on to our website and check out the Sto Wall Selector. You can also visit our Documentation Center for details on the system and product specifications. Or you can talk to one of our experts at 800-221-2397.

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Easy enough, right? Actually, it’s trickier than you might think.

Today’s buildings often include complex geometries and varied substrates. Plus, trade sequencing often creates potential failure points. Using multiple, uncoordinated products can also result in gaps or inconsistent adhesion. Successful systems require cross-compatible materials, trained application and field-tested detailing.

The Role of Continuity in AWRB Systems

The secret to air and water-resistive barrier (AWRB) success is continuity. In other words, continuity across those complex geometries and different substrates, and compatibility between all materials, transitions, penetrations and terminations—from foundation to parapet.

Why is this continuity so important? Because any break or incompatibility in the barrier can compromise performance, leading to condensation, mold growth or structural deterioration. A continuous air and water-resistive barrier, on the other hand, prevents moisture intrusion, air leakage and energy loss.

A Proven, System-Based AWRB Solution

The problem with many existing buildings is a piecemeal mix of materials and products that weren’t designed to work together and have been cobbled together as best the installers could manage. A better approach is the system approach.

StoGuard^® is a proven, system-based AWRB solution that eliminates performance and risk gaps by maintaining continuity across materials, climates and design conditions. All the components of this trusted system have been designed to work together with precision.

The StoGuard^® System

• Can be used behind Sto or non-Sto claddings, offering seamless integration across assemblies
• Combines liquid-applied and self-adhered membrane (SAM) options for flexibility and project-specific needs
• Features fluid-applied components that create a seamless, monolithic layer that easily covers complex shapes and penetrations
• Utilizes self-adhered components that provide immediate waterproofing and durability in extreme conditions
• A set of fully compatible accessories design for use and continuity at movement joints, substrate transitions, penetrations, transitions to roofing and below-grade air barriers, and rough openings.
• Employs a hybrid approach that allows mix-and-match compatibility for transitions, openings and challenging conditions

The StoGuard^® Advantage

StoGuard^® creates a continuous, compatible and tested barrier that meets modern building code and energy performance standards. The benefits to building owners are clear:

• Vapor-permeable and impermeable options are available to suit different climate zones and wall designs
• Tested assemblies are fire-rated and qualified for use on noncombustible construction
• Low-VOC, mold- and mildew-resistant formulations promote healthy indoor environments
• Designed to perform in cold, wet and high-humidity climates, enabling faster installation schedules
• Backed by Sto’s integrated wall system approach—one manufacturer, one system

The Best System for Design Freedom

But the benefits of StoGuard^® don’t end there. By ensuring a consistent AWRB layer, StoGuard allows architects to focus on creative expression without compromising performance. They can get crazy with their geometry. They can go nuts with their different substrates. StoGuard will work beneath them all, quietly keeping air and water at bay for years to come.

StoGuard Delivers the Difference

Sto is a leader in integrated air and moisture barrier technology. StoGuard^® is a clear example of why. With StoGuard^®, air and moisture protection is seamless, tested and complete—ensuring the building envelope performs as designed. Simply put, it makes any wall a better wall.

To learn more, we invite you to download the updated StoGuard brochure for a full overview of components, system compatibility and application best practices. You can also visit our Documentation Center for system details and product specifications. Or you can talk to one of our experts at 800-221-2397.

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In short, the weather is growing more extreme and, as a result, there’s an increasing demand from municipalities, insurers, and property owners for storm-ready and energy-efficient construction. Climate resilience as a design imperative is becoming a mandate. And in high-risk zones, there is a growing emphasis on building performance over cost.

With comprehensive systems for protecting buildings in extreme weather conditions and a reputation as a trusted partner to architects, building owners, and GCs, Sto is ready to help.

Extreme Weather Solutions from the Envelope Experts

Sto Corp. is the innovative world leader in building envelope solutions, including wall cladding systems, air barriers, coatings, and restoration systems. We offer integrated, tested systems that support resilient design across a range of climate stressors, including wind, moisture, and temperature extremes. These systems help reduce long-term building damage, improve occupant safety, and simplify compliance with climate-driven codes and insurance standards.

A few examples of our proven systems include StoGuard^® air and moisture barrier system, StoVentec^® Rainscreen^® Systems, and Sto’s High Velocity Hurricane Zone Systems (HVHZ). Let’s cover each system, one at a time.

StoGuard^®: Airtight and Watertight Protection

The StoGuard^® family of air and water-resistive barrier systems protects buildings against air leakage and moisture intrusion and is featured in all Sto wall systems.

Fully tested and compliant with the most stringent green construction codes, StoGuard^® systems are an ideal choice for design professionals who wish to employ one continuous, fully compatible air and water-resistive barrier system for all exterior walls whether single cladding or multi-cladding.

Features of the StoGuard^® system include:

• Fluid-applied or self-adhered air and water-resistive barrier
• A range of detail components to accommodate wall assembly penetrations like rough openings, scuppers, and dryer vents.
• Prevents moisture intrusion and uncontrolled air leakage
• Withstands wind-driven rain and pressure cycling
• May be used behind non-Sto claddings or be integrated into Sto’s fully engineered exterior wall systems to allow for complete continuity and compatibility of the air and water resistive barrier across the exterior wall.

StoVentec^®: For Buildings that Look Great and Perform Even Better

StoVentec^® Rainscreen^® systems are complete, with all the system components – including the air and water-resistive barrier, thermal insulation, sub-construction, and facade panel – engineered to perform together. And they offer the widest variety of aesthetic options available, including colors, shapes, textures, including glass and fiber cement – in a single source system backed by a 10-year system warranty.

StoVentec^® Rainscreens: Engineered for Moisture and Thermal Control

• Drained and back-ventilated system that protects wall assemblies from water and condensation
• Mineral wool continuous insulation provides thermal stability in hot or cold climates
• Adjustable sub-framing adapts to irregular substrates and supports pressure-equalized rainscreen design
• Noncombustible cladding options, including render, fiber cement, glass, and masonry veneer
• Pre-engineered options with render and fiber cement that allow for reduced engineering time and money

Explore StoVentec^® Rainscreens^® with our comprehensive design guides. Download our guides to discover a redefined Rainscreen^® system that delivers on performance, durability, and the unique blends of glass, render, masonry veneer facades (MVF), and fiber cement from one supplier.

Sto High Velocity Hurricane (HVHZ) Systems: Impact and Pressure Tested

Sto High Velocity Hurricane Zone Systems provide a full range of exterior cladding options to protect against hurricane and tropical storm winds, water intrusion, and wind-borne debris: a leading cause of building envelope failure. All of Sto’s HVHZ Systems are fully engineered and tested, and compliant with Miami-Dade County, Florida NOA criteria for wind load, impact resistance, air leakage, and water resistance.

Features of Sto Hurricane Systems include:

• Options for Rainscreen, EIFS, Stucco HVHZ systems
• Fully tested and fire-resistance rated wall assemblies
• Lightweight and easy to install
• Field applied or prefabricated
• Wide range of aesthetic possibilities from glass, brick, wood, smooth fiber cement or plaster finish
• Tested for Miami-Dade or Florida Product Approval

Sto Support Systems: Ready to Assist

These field-tested, proven systems are ideal for a range of applications and scenarios. A few examples include:

• Coastal buildings requiring wind and water protection, like Seminole Brighton Bay Hotel & Casino and Lido Beach Towers
• Projects focused on energy efficiency and freeze-thaw durability like Bell Bank and Georgia King Village
• Healthcare or essential facilities in storm-exposed areas like UCF Lake Nona Medical Center and HCA Westside Regional Medical Center

Plus, our technical support staff is always available to ensure that you can feel confident in choosing Sto for your building envelope solutions. Sto systems and products undergo extensive and rigorous testing to confirm compliance with regulatory requirements. Our staff is happy to assist in resolving complex details, avoiding code conflicts, and identifying practical construction alternatives through a variety of services, including plan reviews, wall analysis, an extensive details library, application guides, and technical publications.

Building Smarter for a Changing Climate

Extreme weather is becoming the norm. Fortunately, Sto has developed comprehensive resilient design systems that achieve long-term value, occupant safety, and reduced climate-related risk. And that means, despite the unpredictability of the weather, your building’s performance will remain very predictable.

To learn more about Sto’s resilient design systems or request a project-specific consultation, explore our Sto Wall Selector or call 800-221-2397.

The post Designing for Extreme Weather appeared first on Sto Corp..

The purpose of this blog post is to present the differences between a fluid-applied and a self-adhered AWRB, as well as the ideal use scenarios for each, so that you can make an informed decision between the two.

The Purpose of the AWRB

Sto is proud to be a building envelope expert. As evidenced by our high-performance solutions trusted worldwide, we understand AWRBs inside and out. At the core of that expertise is the understanding that air and water are the enemies of building performance. They are constantly trying to find a way inside. The purpose of an AWRB is to stop them.

An AWRB is a continuous barrier across the entire building enclosure that resists both air and water intrusion. Preventing air leakage helps maintain a stable indoor environment and reduces energy consumption related to heating and cooling. Resisting water penetration protects against moisture-related issues such as rot, mold, and mildew.

All AWRBs are designed with the same goal in mind. However, there are several different types of materials for AWRB. We are focused on two common materials: fluid-applied and self-adhered. Let’s begin with the fluid-applied AWRB.

Fluid-Applied AWRBs

The fluid-applied AWRB is installed by either rolling or spraying a liquid membrane onto substrates, such as wall sheathing or concrete masonry units (CMU). The elastomeric or polymer-modified liquid cures into a monolithic barrier offering seamless flexibility.

Key benefits of the fluid-applied AWRB include:

• Seamless coverage, ideal for complex geometries and penetrations
• Time- and labor-efficient for large-scale, straightforward walls
• Good substrate flexibility and adaptability across materials with no mechanical fasteners or additional adhesives

As mentioned earlier, each material type has its own set of tradeoffs. Challenges for the fluid-applied AWRB are:

• Thickness control and weather dependence
• Curing time can delay follow-on trades
• Skilled application required for consistent performance

Now that we know the advantages and disadvantages of the fluid-applied AWRB, let’s sum it up. The best-use case scenarios for this material type include:

• Irregular geometries
• High-production installs
• Warm-weather installs
• Retrofit over CMU or rough surfaces

Self-Adhered AWRBs

Self-adhered AWRBs are commonly referred to as peel-and-stick membranes. These membranes feature a sticky adhesive side (adhesives are typically acrylic, butyl, or asphaltic based) that adheres directly to the substrate, eliminating the need for mechanical fasteners or additional adhesives. The self-adhered AWRB offers both precision and durability.

Key benefits of the self-adhered membranes include:

• Uniform thickness, immediate waterproofing post-install, and no cure time
• UV and puncture resistance for exposed conditions
• More visual QA/QC opportunities

Challenges include:

• Difficult detailing around penetrations and edges
• Manipulating material in-place with adhesive exposed
• Wrinkling, bubbles, and seams can compromise performance if mishandled

The upshot? Self-adhered AWRBs best-use cases include:

• Straightforward assemblies
• Schedule-sensitive builds
• Exposed sheathing areas
• Code-driven durability priorities

High-Performance AWRB Solutions from the Experts at Sto

Sto is the innovative world leader in claddings, air barriers, coatings, and restoration systems. The StoGuard family of air and water-resistive barrier systems includes both fluid-applied and self-adhered membranes and, as such, takes a multi-solution perspective that doesn’t push one product over another, but instead ensures the best solution for each project.

Sto offers a variety of fluid-applied AWRB products, including Sto Gold Coat and Sto GoldSeal STPE. With over 250 million square feet of product installed, Sto Gold Coat can be used on a wide range of substrates, behind most wall claddings, and in varying thicknesses. Sto GoldSeal STPE, the newest fluid-applied membrane, offers moisture-cure chemistry for humid, cold, and wet climates.

Our self-adhered membrane solution is StoShieldSA, a high-performance, self-adhered air and water-resistive barrier available in two configurations: StoShield SA VP (vapor-permeable) and StoShield SA NP (non-permeable). Designed for instant waterproofing, consistent coverage, and cold-weather application, StoShield SA makes envelope design more precise and installation more efficient.

Both solutions are part of the StoGuard^® air and water-resistive barrier system and, as such, are compatible with StoGuard^® Detail Components – a set of accessories that provide durable air and waterproofing continuity at movement joints, substrate transitions, penetrations, and rough openings – and work with our proprietary wall systems. All of our solutions are fully tested and compliant with green construction codes and carry system warranty options.

Technical Support is Always Available

Choosing the right AWRB for your project is critical to long-term protection and performance. Now that you know the differences between fluid-applied and self-adhered AWRBs, you’re ready to make a more informed decision.

In the event you need help selecting the best AWRB for your scenario, Sto Corp. provides various technical services, including:

• Plan Review: Help with complex details, code conflicts, and construction alternatives.
• Detail Drawings: A library of guide details to assist in project planning.
• Wall Analysis: Calculations related to dew point, freeze point, ‘R’ value, and wall thickness to minimize condensation potential.
• Specifications: A library of guide specifications online in their Documentation Center.
• Technical Publications: Information on Sto products, technology, building science, and industry issues.

For more information on StoGuard^® products and systems, visit our website. To contact a Technical Rep for project-specific recommendations and to answer your questions via phone, call 800-221-2397 or complete our contact form.

The post Choosing Between Fluid-Applied and Self-Adhered AWRBs appeared first on Sto Corp..

Building with Conscience isn’t just a tagline for Sto. It’s a guiding principle for the company that serves as a basis for our strategy to pursue products and solutions that are responsible, sustainable and innovative. In other words, our existing products align with modern energy performance standards and set new standards in the industry for better buildings.

Why Energy-Efficiency Matters

There are a range of reasons why we as an industry need to pursue energy efficiency relentlessly. The first and most obvious reason is the more energy efficient the building, the lower the cost to maintain it. Every owner wants that. In addition to reducing operating costs, energy efficiency maximizes occupant comfort and safety.

Not only does Sto strive to create energy-efficient buildings but also buildings that are more durable, require less maintenance, and have longer life cycles while still allowing for design freedom. Sto high-performance wall systems provide superior air and weather tightness and excellent long-lasting thermal performance, thus helping lower energy costs and reducing the carbon footprint of buildings.

So, what are these energy-efficient solutions, and how are they different? Let’s get to it.

A Holistic Approach

Sto takes a holistic approach to energy-efficient and sustainable design. What we mean by that is our products are designed to seamlessly work together, maximizing energy savings while enhancing durability and sustainability. Our comprehensive lineup of energy-efficient solutions includes systems that incorporate Sto GPS Board, Sto Lamellas and our iQ Technology products–StoColor^® Lotusan^®, StoLit^® Lotusan^®, and StoColor^® Dryonic^®.

Sto Intelligent Technology + Design (iQ Technology) interweaves innovation with design to offer high-performance finish and coatings with unique attributes based on biomimicry principles that allow facades to stay clean longer than conventional paints and coatings, reducing maintenance and the operational carbon footprint of the building. The functionality behind each of these coatings is inspired by nature and designed to address the true needs of a building, not just the standards. Because these coatings deliver improved function through optimized product attributes, property owners will realize greater durability and lower lifecycle costs.

But our advanced coatings and finishes are only the beginning. Sto offers a number of other solutions that support energy efficiency, including:

Sto GPS Board

A graphite-enhanced, expanded polystyrene (GPS) insulation board that is recyclable, fluorocarbon-free, boasting a 4.7 R-value and allowing for thinner walls. It is intended for use in StoTherm^® ci, StoPowerwall^® ci, and StoPanel^® GPS systems.

StoTherm^® ci Systems

StoTherm^® ci Systems integrate the following key elements – continuous insulation (ci), air and water-resistive barrier, drainage and a variety of finish options to create a superior, sustainable wall cladding. As proven in the EIMA Exterior Wall Cladding Performance Study, this high-performing, lightweight, and eye-catching system saves energy and stays attractive for years. StoTherm^® ci improves indoor comfort and air quality while maintaining maximum curb appeal and lowering overall lifecycle costs. Sto also offers advanced stucco wall systems that include continuous insulation and StoGuard, an air and water-resistive barrier system that protects buildings against air leakage and moisture intrusion.

StoGuard^® Air and Water-Resistive Barriers

Fully tested and compliant with the most stringent green construction codes, StoGuard^® systems protect buildings against air leakage and moisture intrusion and are an ideal choice for design professionals who wish to employ one continuous, fully compatible air and water-resistive barrier system for all exterior walls on multi-cladding buildings.

StoGuard Detail Components are a set of fully compatible accessories designed for use with Sto products that provide continuous air and water-resistive barriers for all exterior walls. StoGuard Detail Components are typically installed first, then overcoated with the fluid-applied membrane, adding extra protection at critical areas such as movement joints, substrate transitions, penetrations, and rough openings, ensuring a durable barrier.

Sto Fireblocking

Sto Fireblocking is a unique, patent-pending solution designed to meet the stringent 2022 New York City Building Code for exterior wall assemblies. Built on technology trusted in Europe for over twenty years, Sto Fireblocking features the use of Sto Lamellas, a non-combustible fireblocking product, and is engineered and tested for use with Sto EIFS, stucco and rainscreen systems.

Energy Efficiency and Aesthetic Brilliance. See for Yourself.

Not only do our energy-efficient solutions deliver outstanding performance, but they also look incredible, and the versatility allows you to achieve virtually any look. But don’t take our word for it. Check out our project gallery to see for yourself. We’ve highlighted a few of our favorite projects below if you want to take a quick peek.

Bell Bank

Location: Fargo, North Dakota
Building Type: Commercial
Construction Type: Renovation

See how Sto’s energy-efficient solutions converted an old slip-form concrete structure into a modern work of art that is capable of withstanding Fargo’s brutal winter weather.

The Heritage

Location: New York, New York
Building Type: Multi-Family
Construction Type: Renovation

See how StoTherm^® ci helped transport these iconic residential towers that overlook Central Park into the age of efficiency.

Georgia King Village

Location: Newark, New Jersey
Building Type: Multi-Family
Construction Type: Renovation

Discover how StoTherm^® helped modernize this affordable housing development project that included eight facades, multiple drops and a difficult design pattern to follow.

The Atrium at Sumner

Location: Brooklyn, New York
Building Type: Multi-Family
Construction Type: New

Learn how the StoTherm^® ci system aided the New York City Housing Authority in incorporating Passive House energy efficiency standards into this new senior housing building.

Edgewater Condominiums

Location: North Myrtle Beach, South Carolina
Building Type: Multi-Family
Construction Type: Renovation

Read how all the old stucco was replaced with 250,000 SF of StoTherm^® ci Lotusan^® continuous insulation wall system, which led to more energy-efficient and newer-looking buildings.

White Castle

Location: Orlando, Florida
Building Type: Retail
Construction Type: New

To build their largest restaurant to date, White Castle used a combination of StoTherm^® systems to increase energy efficiency and provide protection against Florida’s frequent tropical.

Innovative Energy-Efficient Solutions from an Industry Leader

At Sto, we’re building smarter so you can too. It’s part of our mission and it’s our commitment to you. Our energy-efficient solutions are helping building owners create high-performance building envelopes that will reduce maintenance, lower operational costs, and increase longevity. And because Sto designs the products to work together seamlessly, you don’t have to piecemeal a system together. Sto can be your single-source provider, with everything falling under one warranty.

To learn more about Sto’s energy-efficient solutions, visit www.stocorp.com or call (800) 221-2397.

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Fortunately, there’s a comprehensive, proven solution that delivers on these fronts and others. It’s called a Rainscreen System.

A complete Rainscreen System is comprised of several key structural components that work together to manage airflow and moisture effectively; these components include:

• Outer cladding material: The cladding is your building’s first line of defense. Depending on the building’s climate zone and local environment, you’ll want to choose the cladding type–fiber cement, metal panel, HPL, specialized render systems, etc.–based on the hazards present and the level of protection needed.
• Sub-construction: a structural system of brackets, rails, fasteners, and accessories that serves as the framework for the outer cladding material. This system absorbs both the wind and dead loads on the facade and is adjustable, accommodating uneven substrates and various facade cladding materials.
• Air gap or cavity: A ventilated space behind the cladding that helps manage moisture. A modern rainscreen system incorporates a larger air gap to promote drainage and drying of wall assemblies.
• Exterior insulation: This outer layer of insulation is capable of handling some moisture and drying without degrading or reducing its R-value. Depending on the thermal requirements and targets, this layer may be supplemented. Also, Energy codes require different degrees of exterior wall thermal performance.
• Air and water-resistive barrier (AWRB): This is attached directly to the building’s substrate and is the last line of defense against air leakage and moisture intrusion. Depending on the climate, the AWRB may be permeable or impermeable to water vapor.
• Venting profiles: There are several ventilation options available to help direct moisture away from the wall surfaces and to keep out pests.

Today’s rainscreens are nothing short of marvels of modern science. If you’re considering installing one, you’ll want to be aware of building codes that have impacted the implementation of these systems.

An Evolving Building Code

In recent years, we’ve seen a wave of new building codes. Many of these provide specifications that impact the implementation of a rainscreen system. Below are a couple of examples.

2021 Building Code Changes for Water-Resistive Barriers

Evolving building codes aim to create more resilient buildings. The 2021 International Building Code (IBC) and International Energy Conservation Code (IECC) made several changes to air and water-resistive barriers (WRBs) and air leakage, including:

• WRB compliance methods can include materials other than #15 felt.
• Registered design professionals or approved agencies must verify and commission air barriers when not testing
• Air barrier and air sealing details must be included on project drawings
• Air leakage testing requirements now include residential and non-residential buildings
• Performance verification is now required for buildings that are not tested
• Requirements to seal basements, slabs, and unvented crawlspaces at any penetration in the foundation or slab

Section BC 718.2.6

This New York City Building Code outlined the requirements for fireblocking within concealed spaces of exterior wall coverings, including the conditions and locations where fireblocking is required. Fireblocking must be installed within exterior wall assemblies that contain combustible components even when the wall assembly has previously passed the NFPA 285.

Assembly testing is becoming more and more critical in these new fire codes. Buildings must have a cohesive assembly designed to minimize fire risk, such as StoVentec, which is a fully tested assembly. Multiple wall claddings from various suppliers will be more heavily scrutinized in the years ahead.

The Importance of Proactive Moisture Management

Moisture accumulation within a building structure can cause problems such as water stains, ice damage, peeling paint, wood deterioration, mold, and mildew. Liquid water forms when water vapor in the building meets a surface with a temperature lower than the dew point of the air.

Whether or not the building is air and weather-tight can considerably affect thermal performance. A drafty, leaky building will undermine efforts to insulate, as heat will escape through the gaps that cause drafts and leaks.

For all these reasons and considering that water intrusion is a growing problem, the industry is pushing building owners to be more proactive in controlling moisture.

According to the E.P.A., a building’s design must include three features to control moisture. These features are:

• Controls bulk liquid water from snow, rain, etc.
• Stops a buildup of indoor humidity and water vapor migration by diffusion and airflow to minimize condensation and moisture absorption into cool surfaces and materials
• Made with moisture-resistant building materials

These features can be found in a modern rainscreen system like StoVentec^® Rainscreen^® Systems. Qualitative and quantitatively measured for rainscreen performance via AAMA 509 which tests wall assemblies against both static and dynamic air pressure with water spray simulating severe weather conditions and rates each system with classifications for water and ventilation.

An Innovative Solution that Meets Expectations and Standards

StoVentec^® Rainscreen^® Systems aim to exceed building code requirements by providing superior moisture management and resilience against severe weather, ensuring long-term building performance and durability.

StoVentec Systems are a complete, fully-tested, and code-approved high-performance ventilated Rainscreen system. This includes a best-in-class air and water-resistive barrier, robust mineral wool continuous insulation, the most installer-friendly, adjustable sub-framing system available, and StoVentec Rainscreen cladding.

Benefits of StoVentec Rainscreen include:

• High-quality air and water-resistive barriers
• Non-combustible insulation
• Adjustable sub-framing
• Accommodates a wide variety of finishes and aesthetics

System Versus Component Approach

A system approach is when you specify a complete system from one manufacturer, and the components are all designed to work together. Sto offers a complete Rainscreen System with comprehensive testing, third-party code compliance evaluations, Florida Approvals and Miami-Dade NoAs. For example, Intertek Code Compliance Research Report 0454 evaluates the StoVentec Render and Masonry Veneer Facades systems for physical properties, weather resistance, wind resistance, surface burning characteristics, fire-resistance-rated construction, and use in Types I, II, III, and IV construction against the IBC, IRC, Florida Building Codes, and California Building Codes. The report also references and incorporates the independent evaluations dedicated specifically to the various Sto air and water-resistive barrier options, the all-important last line of defense in rainscreen wall systems. Further, the evaluation is built on a quality assurance program with independent random audits of production facilities which verifies the StoVentec system components are manufactured according to strict quality controls.

Other manufacturers only offer wall components, e.g., a single element in the system, such as cladding or insulation, leaving it up to architects and contractors to determine how these various bits and pieces should all come together. The component approach presents a range of challenges.

Challenges with the Component Approach

• Components aren’t always designed to work together, resulting in design collisions
• Many materials, players, and warranties often result in no party accepting full ownership of a problem
• Achieving aesthetic goals while meeting code requirements can strain a budget
• Misalignment of metal panels due to incompatibility/improper use of facade layer with sub-structure layer

Benefits of the System Approach

• Seamlessly connects design and construction
• Fewer products and subcontractors
• Improved constructability and project delivery
• One warranty – single supplier
• Compatibility of components
• Fully tested assemblies
• Weathertight transitions due to a single AWRB

When you select a complete Rainscreen System, you should receive details from the manufacturer defining:

• Air & water-resistive barrier
• Support structure, including attachment to the substrate
• Exterior insulation
• System ventilation
• Finish cladding
• Testing & warranty information

Real-World Applications and Compliance

It’s a harsh world out there, and StoVentec is up to the challenge. Here are some highlights from a couple of projects that demonstrate the possibilities.

Zislis Residence

Location: Manhattan Beach, California, USA
Building Type: Residential
Construction Type: New

When Michael Zislis, a successful entrepreneur, hotelier and restaurateur, was ready to build a home on the California coast for his young family, he wanted the exterior to be bold. When he learned about the enhanced aesthetic value and advanced performance properties of StoVentec Glass, Zislis was immediately intrigued.

With the home’s beachside location, StoVentec Glass was the ideal product. The multiple-sized panels of StoVentec Glass in varying shades of blue provide a unique appearance for a residential home. Because the product is tempered glass, it maintains reflective properties for a dazzling, durable exterior finish. The glass-faced panels integrate with thermal insulation and an air and moisture barrier to create one complete system that delivers stunning curb appeal and optimal performance characteristics.

Read the entire case study here.

Kalamazoo Justice Center

Location: Kalamazoo, Michigan USA
Building Type: Institutional
Construction Type: New

Located in downtown Kalamazoo, MI, the Kalamazoo Justice Center appeared to be a construction challenge. The building design featured a large glass expanse on the south side of the building, a curtainwall that would maximize natural lighting for the interior spaces. That same south-facing side of the building was to include a ground-floor pre-screening lobby. For the fascia of the one-story lobby space, the architects needed a product that visually extended the aesthetic of the modern glass curtainwall.

StoVentec Glass was the perfect fit since it is an insulated glass panel rainscreen system without visible hardware, so the fascia doesn’t feel like a framed curtainwall with hardware on the top, bottom, and sides. The fascia band on the lobby entrance area features nearly 700 square feet of StoVentec^® Glass in an Ad Weiss Optiwhite Glass (9001W) color.

StoVentec^® provides the striking visual effect the architects desired with the added bonus of delivering on performance and durability.

Read the entire case study here.

Want to see and read more real-world examples of how our robust Rainscreen System meets building codes and delivers superior protection for today’s buildings? Explore our full Project Gallery. From the functionality inside to the finish outside, this incredible system will help you meet your thermal and moisture goals while delivering a one-of-a-kind aesthetic.

Intelligent Solutions from an Industry Leader

Sto Corp. is the world’s leading innovator in claddings, air barriers, coatings, and restoration systems. By offering advanced rainscreens, such as StoVentec^® Rainscreen^® Systems, we are helping architects and builders achieve code compliance, enhance building longevity, and reduce maintenance costs.

For more information about StoVentec or Sto Corp., please visit www.stocorp.com or call (800) 221-2397.

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It wasn’t so long ago that we believed insulation alone could protect a building from all the damaging elements outside. But after decades of costly repairs due to water intrusion, mold and mildew, and corroded structural component repairs, along with advances in building science, we learned there’s more to effective thermal and moisture control—a lot more.

Thermal and moisture control are so important that they are two of the five planes of control needed for buildings to be energy-efficient, durable, safe, and sustainable while still providing aesthetic appeal. The five planes of control working in unison comprise The Perfect Wall.

Knowing how important these control layers are, let’s tackle them one at a time, starting with moisture control.

Moisture Control 101

Moisture accumulation within a building structure can cause problems such as water stains, ice damage, peeling paint, wood deterioration, mold, and mildew. Liquid water forms when water vapor in the building meets a surface with a temperature lower than the dew point of the air.

Whether or not the building is air and weather-tight can considerably affect thermal performance. A drafty, leaky building will undermine efforts to insulate, as heat will escape through the gaps that cause drafts and leaks.

In recent years, moisture management has become a focus of building owners and manufacturers due to growing awareness of its impact, higher expectations for building performance, and more stringent building codes and regulations. At Sto, we are proud to be a leader in innovative, sustainable building solutions that enhance aesthetic value, durability, and energy efficiency, addressing the evolving needs of modern construction. The StoGuard® System is one such innovative system.

Seamless Control Over Air and Moisture

Unlike building wrap barriers that are penetrated by staples and fasteners for their

attachment, the StoGuard® System provides seamless control over air and moisture to improve building performance and occupant comfort. Fully tested and compliant with the most stringent green construction codes, StoGuard systems are an ideal choice for design professionals who wish to employ one continuous, fully compatible air and water-resistive barrier system for all exterior walls on multi-cladding buildings. Benefits of StoGuard systems include:

• A fluid-applied system that forms a seamless air and water-resistive barrier
• Protects against moisture intrusion and unwanted air movement
• Variety of air and water-resistive barrier (AWRB) membrane products to choose from, depending on project requirements
• All Sto systems incorporate an AWRB, vital for maintaining the integrity of the building envelope and preventing moisture-related issues like mold and rot
• Accessories designed for use with Sto fluid-applied membranes at movement joints, substrate transitions, penetrations and rough openings are available
• A fully tested and proven system
• One supplier for all components means one warranty covers everything

The Importance of Continuous Insulation

Now that we have moisture control covered, let’s talk about thermal control. Heat loss can significantly affect the cost of operating a building and the comfort of those inside. In most climate zones, energy codes prescriptively require continuous insulation in wall assemblies for commercial and residential construction. Sto has more than 40 years of experience and practical application of insulated wall systems, so you can rely on us to provide the right solution for your needs. Thermally insulating the exterior of the wall structure with continuous insulation makes sound technical sense on several levels.

• The building is effectively wrapped in a thick, well-insulated and protective blanket
• The effects of thermal bridging are minimized, and the ability to achieve high thermal performance is simplified
• When combined with high-performance finishes, the insulation layer keeps the wall structure warm and dry
• Maintains the temperature of the building wall structure above the dew point, reducing the risks for condensation caused by water vapor diffusion

One of the most advanced continuous insulation wall systems available is StoTherm® ci.

More Than Insulation, A Complete System

StoTherm® ci is a decorative cladding with continuous insulation and StoGuard Air and Water-resistive Barrier combined with Sto high-performance finishes. This advanced exterior insulation and finish system provides superior energy efficiency by combining insulation with aesthetic and protective layers, which is crucial for managing thermal bridges and enhancing overall thermal performance.

When it comes to complying with the rapid changes in energy standards, StoTherm ci systems consistently offer more than most other wall systems. The seamless cladding systems provide optimal performance that meets or exceeds ASHRAE design standard 90.1-2019, the 2018 IECC energy code requirements for continuous insulation, and Title 24 requirements for energy efficiency.

Combining innovative design and high-level performance, StoTherm ci offers a unique approach to wall system design. Choose from a wide range of colors and textures for every exterior, giving you the freedom to create truly unique features. No matter the look or looks of the building, StoTherm ci systems offer unprecedented flexibility to your building’s design. The possibilities are virtually limitless, from architectural shapes and eye-catching finishes to high-performance coatings.

Based on testing in compliance with NFPA 285 and NFPA 268, all StoTherm ci systems are suitable for use on noncombustible construction. With the Sto Fireblocking option, Sto also offers a unique patent-pending solution to comply with the 2022 New York City Building Code (NYC BC), which requires fireblocking for exterior wall assemblies that contain combustible components such as foam plastic insulation, as stated in BC 718.2.6.

A Historic Building Gets an Energizing Facelift: A Case Study

Modern technology is rescuing old buildings from their thermal and moisture challenges every day. The Lido Beach Towers Condominium in Long Island, New York, is the perfect real-world example of how the right system can make an old building new again.

With over 100 leaks in 140 units, the Lido Beach Towers had fallen far from its glory days as an upscale beachfront hotel on the Atlantic Ocean in the early 1900s when it was known as The Pink Lady. The deterioration accelerated in the years following its conversion to a condominium property in the 1980s.

Fortunately, the building owners recognized that it was time to address the problems at their core and add layers of protection to restore some of this storied building’s former glory. Read the case study and watch the transformation on video.

Intelligent Solutions from an Industry Leader

Sto is proud to be a leader in sustainable building practices that reduce maintenance costs and enhance indoor air quality. Our innovative solutions, which provide greater thermal and moisture control for building owners, have been proven and trusted for decades. We invite you to learn more about StoTherm ci, StoGuard, and our complete offering of wall systems. For more information about Sto Corp, visit Stocorp.com.

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A significant development in the evolution of building protection occurred in the 19th century during the Industrial Revolution. Construction became recognized as separate from design. Physics, mathematics, chemistry and thermodynamics were all being developed and applied to create building science as a discipline. At the same time, architecture, engineering and construction were all becoming more defined. Suddenly building protection was about much more than insulation.

A Highrise Changes the Game

Often referred to as the world’s first skyscraper, the Home Insurance Building in Chicago was erected in 1885 and stood until 1931. The building was designed by William Le Baron Jenney and weighed as much as one-third of typical masonry buildings, which concerned city officials.

According to History.com, “His revolutionary design utilized an inner skeleton of vertical columns and horizontal beams made out of steel. This was in stark contrast to earlier structures, which were supported by heavy masonry walls. Steel was not only lighter than brick, but it could carry more weight. With this new method of construction, lighter masonry walls could be “hung,” a bit like curtains, from the steel frame. As a result, the walls of the building didn’t have to be as thick, and the structure could be much higher without collapsing under its own weight. Buildings with this type of frame could also have more windows, as the steel frame supported the building’s weight and the stone or brick exterior merely acted as a “skin” to protect against weather.”

The emergence of building science led to this project, marking the building envelope’s beginning.

Science Fills in the Insulation Gaps

While insulation had improved since the days of mud and fur, it was still built on the idea that the Greeks had developed hundreds of years before. Fortunately, science and technology would also benefit this necessary building material.

One of the most significant developments was the widespread use of fiberglass insulation in the 1930s. More recently, it was the increased use of polyurethane foams for filling the cavities between walls. These more advanced products helped our homes and buildings achieve greater comfort while improving energy efficiency.

Insulation That Achieves More with Less

At Sto Corp., sustainable construction is ingrained in our company’s DNA. This commitment guides us in our decision-making and product development. Our GPS insulation is the perfect example of our continuous pursuit of greener products, representing the future of insulation. GPS (graphite polystyrene) is a rigid, graphite-enhanced, 100% closed-cell expanded polystyrene insulation board. We use graphite because it is the most stable form of carbon – safe and chemically inert. Plus, it reduces thermal conductivity and increases the R-value by as much as 25%.

The primary difference between GPS and traditional insulation products is that GPS insulating boards are thinner. In fact, they are up to 20% thinner than other rigid insulation boards. That means less material is required to achieve the same R-value. And the product itself is recyclable, making it more environmentally friendly.

For additional information on the various types of insulation offered by Sto and to compare the features and benefits of each, visit our insulation comparison web page.

Advancement in Material Science and Engineering

With each passing year, breakthroughs in materials science and technology push the boundaries of what’s possible, leading to stronger, more sustainable and more resilient buildings. Nanotechnology is enhancing construction materials with improved strength, durability and thermal conductivity. The result is layer upon layer of building protection that is more advanced than ever.

Smarter, Longer-Lasting Coatings and Finishes

At Sto^®, we have a long, proven history of developing innovative coating technologies. Now, we’ve developed a group of architectural coatings that provide more value by providing more functionality. Sto Intelligent Technology + Design (iQ Technology) interweaves innovation with design to offer high-performance coatings with unique attributes based on biomimicry principles that enhance aesthetics and improve occupant comfort.

The functionality behind StoColor^® Dryonic^® and StoColor^® Lotusan^® is inspired by nature and designed to address the true needs of a building, not just the standards. Because these coatings deliver improved function through optimized product attributes, property owners will realize greater durability and lower lifecycle costs. This technology is also available in StoLit Lotusan, a textured finish that captures the look of traditional plaster, brick, or limestone with self-cleaning properties.

State-of-the-Art Rainscreens

Today’s rainscreens are nothing short of marvels of modern science. They are comprised of several key structural components that work together to manage airflow and moisture effectively; these components include:

• Outer cladding material: The cladding is your building’s first line of defense. Depending on the building’s climate zone and local environment, you’ll want to choose the cladding type–fiber cement, metal panel, HPL, specialized render systems, etc.–based on the hazards present and the level of protection needed.
• Air gap or cavity: A ventilated space behind the cladding that helps manage moisture. A modern rainscreen system incorporates a larger air gap to promote drainage and drying of wall assemblies.
• Air and water-resistive barrier (AWRB): This is attached directly to the building’s frame and is the last line of defense against air leakage and moisture intrusion. The AWRB may be permeable or impermeable to water vapor, depending on the climate.
• Exterior Insulation: This outer layer of insulation is capable of handling some moisture and drying without degrading or reducing its R-value. Depending on the building owner’s thermal requirements and targets, this layer may be supplemented. Also, Energy codes require different degrees of exterior wall thermal performance.
• Venting Profiles: There are several ventilation options available to help direct moisture away from the wall surfaces and to keep out pests.

The Perfect Wall

Technology advancements have also allowed modern construction to achieve the perfect wall, a complete, engineered system that performs better and saves money over the long term. The perfect wall contains all four building enclosure control layers:

• Air Control Layer – To limit the uncontrolled flow of air through the wall assembly, reducing condensation and energy loss.
• Water Penetration Control Layer – Barrier inbound of the cladding, flashed to the exterior, designed and installed to prevent liquid water from entering the wall cavity.
• Vapor Control Layer – Vapor permeable or impermeable per designer specification, controls the flow of water vapor from areas of high to low pressure, minimizing condensation.
• Thermal Control Layer – Insulation to significantly reduce thermal bridging.

Sto offers a wide range of wall systems, from prefabricated wall panels to EIFS with drainage, plus many more. From superior performance and sustainability to inspired aesthetics, your perfect wall is just a few clicks away with the Sto^® Wall Selector.

Material Science: The Next Generation of Building Products

The pace at which material science is advancing is ever-accelerating. Lightweight cladding is the next big thing for the construction industry. With lightweight cladding, it’s no longer necessary to use heavy materials such as masonry, concrete, metal panels, precast, porcelain, or even fiber cement to achieve the look of brick, wood, concrete, or metal. The benefits of lightweight cladding include:

• Smaller carbon footprint
• On-the-wall energy performance
• Authentic aesthetics
• Simpler and safer for construction crews
• Lower energy bills
• Near limitless design freedom for architects

StoCast, one of our most exciting and popular new products, is an example of this innovative new cladding. StoCast Wood is a resin cast product that can be applied to a variety of Sto wall systems to deliver a real wood aesthetic. StoCast Brick replicates the look of traditional brick and is available in 30 standard bricks or project-specific colors, patterns and textures.

The Future of Building Protection is Here

Building protection has come a long way since the days of mud and fur. At Sto, we are proud to be a leader in innovative, sustainable building solutions that enhance aesthetic value, durability and energy efficiency, addressing the evolving needs of modern construction. We invite you to learn more about our rainscreens, coatings and finishes. For more information about Sto Corp. and our building envelope solutions, visit Stocorp.com.

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Where possible, having one comprehensive system from a single manufacturer surrounding the entire structure eliminates the risk of gaps and, as a result, exposure to the elements. Any perceived benefits from the multi-system approach aren’t worth the risk of potential wind and water damage. But what about all those components that need to work together? Sto has you covered.

The Components of the Building Envelope

Building envelope systems form the primary thermal barrier between the interior and exterior environments and include all the components of a building’s outer shell. A high-performing building envelope design should prevent air leaks and moisture intrusion through an exterior wall by applying continuous air and water-resistive barriers to manage water infiltration and accumulation. The building envelope includes all of the following:

• Above-grade exterior walls: structural and nonstructural
• Below-grade walls
• Fenestration: windows, doors, and metal/glass curtain walls
• Roofs
• Atria

The Benefits of a High-Quality Building Envelope

Successful application of a building envelope provides many benefits to a building:

• Moisture Control: Stops moisture infiltration by preventing condensation in the wall system to resist structurally damaging mildew and mold.
• Energy Efficiency: Prevents air infiltration through the wall, reducing energy use and costs
• Indoor Environmental Quality (IEQ): Creates comfortable, mold-free buildings, enhancing overall indoor air quality.
• Durability: Manages moisture and air infiltration in a building’s wall system to lower the risk of corrosion and decay and significantly reduce costly maintenance and repairs.
• Safety: Controls airborne pollutants, solar radiation, and the spread of smoke and fire.

Engineering the Best Building Envelope Technology

Sto is a leader in engineering innovative building solutions. The StoGuard^® family of air and water-resistive barriers creates a seamless protection system that meets modern construction demands and stands up to extreme weather events. The integrated design provides unmatched moisture and air leakage protection for durable, energy-efficient, above-grade exterior walls. Plus, the products are created to work together. The superior adhesion between the membrane, detail components, and substrate creates a unified system that enhances performance and decreases the risk of failure. This robust system includes fluid-applied air and water-resistive barriers and StoGuard Detail Components to provide continuity at movement joints, substrate transitions, penetrations, transitions to roofing and below-grade air barriers, and rough openings:

StoGuard^® Conformable Membrane

A self-adhered membrane flashing for use over prepared vertical above-grade concrete, concrete masonry, brick masonry, wood sheathing, glass mat gypsum sheathing, and cementitious sheathing, as part of a StoGuard^® air and water-resistive barrier system. It features an aggressive pressure-sensitive adhesive that allows primerless installation at temperatures as low as 20°F. The tough facer membrane provides an impressive 1,470% elongation, allowing StoGuard Conformable Membrane to readily conform to complex building shapes. The result is a versatile transition membrane for detailing areas to provide flexible connections and continuity of the air barrier system.

Sto RapidGuard^®

A moisture-cured, damp surface tolerant StoGuard Detail Component used for sheathing joint treatments featuring a one-component fabric or mesh-based product designed for seamless joint treatment and sheathing protection.

StoGuard Fabric

A tough reinforcement designed to be saturated with Sto Gold Coat^®, Sto AirSeal^® or Sto VaporSeal^® to produce a waterproof flexible flashing material.

Sto Gold Fill

A ready-mixed, flexible joint compound, air barrier material. It is applied with StoGuard^® Mesh to rough openings and wall sheathing joints.

StoGuard Mesh

A glass fiber self-adhesive mesh for use with Sto Gold Fill^®.

Sto Detail Mesh

A specially designed coated glass fiber fabric used as base coat reinforcement and for impact resistance in Sto insulated wall claddings, including StoTherm^® ci systems, StoQuikSilver^® cement board stucco systems, and Autoclaved Aerated Concrete (AAC) wall applications. It can also be used to reinforce Sto Gold Coat TA and Sto Gold Fill.

A Building Envelope that Delivers Today and Tomorrow

The science behind building envelopes has evolved due to the growing demands and expectations of building owners. Sto is a driving force behind that innovation. Unlike systems created from multiple sources that could leave a building exposed, our comprehensive system has been engineered from the ground up to work as a seamless unit, delivering on all performance needs, saving time and money, and reducing labor, complexity, and risk. In short, our building envelope is unmatched and ready for whatever Mother Nature throws at it.

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Vapor-permeable or impermeable liquid-applied AWRB materials form a membrane upon drying and curing that bonds to the exterior sheathing without fasteners. Liquid-applied AWRB membranes can be used behind any cladding, including: exterior insulation and finish systems (EIFS), glass panels (opaque), fiber cement, brick, stone, stucco, and metal panels. Liquid -applied materials can be used as wall membranes as well as flashings around rough openings, penetrations, etc.

AWRB Performance Requirements

Building codes mandate the performance requirements for AWRB products. They specify that AWRB materials must comply with the 2021 International Building Code (IBC 1402.2) requirements for water resistance and vapor permeability and the 2018 International Residential Code for water resistance (IRC R703.1.1). 

Applicators can choose from several qualifying AWRB materials, including self-adhered membranes, concrete, spray foam, building wraps, integrated sheathings, sheet goods, thermal insulation boards, and liquid-applied membranes. Crucial components of a high-quality AWRB include high tear strength, durability, ultraviolet resistance, and straightforward installation.

In addition, accessory materials (reinforcing mesh, tapes, sealants, sheet goods, elastomeric materials, self-adhered membranes, and foam products) can be used in conjunction with liquid-applied AWRB to provide continuity of air or water resistance. 

Contact the professionals at Sto today for guidance and assistance in choosing the best liquid AWRB and the right accessories to integrate to achieve a tight building envelope. 

Benefits of Liquid-Applied AWRB Membranes

Liquid-applied air and water-resistive barriers provide many advantages that save time and money and help preserve the health and integrity of a building:

Quick Application

A qualified installer can quickly roll or spray the air and water-resistive barrier membrane on the wall to save both time and money. In addition, a spray-applied vapor barrier does not need a primer, which further saves time.

Durable

A liquid-applied AWRB barrier will not lose its integrity when exposed to outside elements during and after construction. Check with the manufacturer’s recommendation for length of exposure.

Permits Complex Detailing

A liquid-applied AWRB efficiently adheres to and waterproofs various wall conditions (e.g., detailed wall openings, penetrations, fasteners, and repair locations), conforms to uneven substrates, and adapts to complex architectural substrate geometry and is the ideal choice when waterproofing critical details.

In contrast, sheet-applied air and moisture barriers need cutting, folding, lapping, and sealing.

Moisture Barrier

When applied at the proper thickness, a liquid-applied vapor barrier produces a seamless moisture barrier by limiting installation errors that can cause lap joints, tears, and holes.

Air Barrier

A liquid-applied AWRB stops air leakage, reduces energy costs and condensation, and improves occupant comfort.

Rainwater Barrier

Liquid-applied barriers for pressure-equalized or pressure-moderated wall design will lower the risk of rainwater penetration through the wall system.

Wind Barrier

A liquid-applied AWRB provides structural and full adherence for rigidity and stability against extreme wind events.

Reduces Repairs

A liquid-applied AWRB membrane protects the sheathing and rough openings from weather damage during and after construction, which reduces repair and replacement costs.

Safe

Safe to use, V.O.C.-compliant AWRB offers easy cleanup.

Sto Liquid-Applied AWRB Membranes and Detail Components

The StoGuard family of air and water-resistive barrier products includes impermeable liquid-applied membranes or vapor permeable air barriers, depending on the wall design and climate: Sto Gold Coat®, Sto AirSeal®, Sto ExtraSeal®, and Sto VaporSeal® – all work as quality water and air barriers when used with StoGuard® Detail Components a set of fully compatible accessories. These Detail Components are designed for use with StoGuard fluid-applied AWRB products at movement joints, substrate transitions, penetrations, transitions to roofing and below-grade air barriers, and rough openings.

Sto Liquid-Applied AWRB Membranes

Sto Gold Coat®, Sto AirSeal®, and Sto VaporSeal® apply easily with a roller or spray, which reduces the required application skill level. Sto ExtraSeal® is trowel-applied. 

Sto Gold Coat®

Sto Gold Coat is a vapor-permeable, flexible, ready-mixed fluid-applied membrane that can be installed on various substrates including:

• as part of StoTherm®, StoQuik®, StoPowerwall®, and StoVentec® wall systems and behind most exterior claddings, including rainscreen, metal, wood, stone, brick, and masonry. 
• Sto Gold Coat application is available in 3 specifications based on desired thickness: substrate-driven, medium build or high build, depending on the project requirements.

Simply apply Sto Gold Coat® fluid-applied membrane with a roller or spray directly to vertical above-grade wall sheathing and concrete masonry. It functions as a waterproof air barrier when used with StoGuard® Detail Components.

Sto AirSeal®

Sto AirSeal is a flexible, ready-mixed fluid-applied membrane that can be installed on various substrates:

• as part of StoTherm®, StoQuik®, StoPowerwall®, and StoVentec® wall systems and behind most exterior claddings, including rainscreen, metal, wood, stone, brick, and masonry. 
• Sto AirSeal application is available in 3 specifications: substrate-driven, medium build or high build, depending on the project requirements.

Sto AirSeal® features 500 percent elongation and meets ASTM C1305 Low-Temperature Crack Bridging requirements. Sto AirSeal®’s unique elasticity of viscosity makes it a superior choice for high-build installations.

Sto ExtraSeal® 

Sto ExtraSeal® is a vapor-permeable, Portland cement-based,trowel or spray-applied AWRB that can be applied over prepared above-grade concrete masonry (CMU) and concrete walls beneath StoPowerwall and Sto-listed ASTM C926 compliant stucco brown coats to provide substrate water and air leakage.

Sto VaporSeal®

Sto VaporSeal® is a Class 1 Vapor Retarder that can be applied using a spray or roller on various substrates, including:

• as part of StoTherm®, StoQuik®, StoPowerwall®, and StoVentec® wall systems

and behind most exterior claddings, including rainscreen, metal, wood, stone, brick, and masonry. 

Sto VaporSeal® features 500 percent elongation and it meets the requirements of ASTM C1305 Low-Temperature Crack Bridging requirements.

StoGuard® Detail Components, in combination with Sto liquid-applied membranes, provide durable, continuous air and water-resistive barriers at vital areas like penetrations, movement joints, substrate transitions, roofing, transitions to rough openings, and below-grade air barriers. Normal methods are to apply StoGuard® Detail Components and then overcoat them with the liquid-applied membrane.

Why Choose Sto Liquid-Applied AWRB Products?

The Sto roller or spray-applied family of liquid-applied AWRB products gives builders and architects a superior solution to their application and weather barrier design challenges. Our simple-to-apply products save time and money during the application process and maintain their integrity for the building’s lifetime.

Contact our Sto professionals today for more on liquid-applied AWRB and Detail Components!

The post Liquid Applied AWRB Membranes: A Comprehensive Guide appeared first on Sto Corp..

In 2000, the International Code Council (ICC) developed the International Energy Conservation Code (IECC). The purpose of the IECC is to establish the minimum design and construction energy efficiency requirements for renovated and new buildings. Between 2006 and 2021, the IECC increased its efficiency requirements by about 40 percent – an average of 8 percent per cycle.

The IECC uses ASHRAE 90.1 (the minimum requirements for energy-efficient buildings, except for low-rise residential buildings) as the ICC referenced standard for energy-efficiency. The ICC Referenced Standards Guide is an industry agreement of the level of performance in the designing, manufacturing, testing, and installing of materials, products, or assemblies. ICC Referenced Standards only become law once a jurisdiction references them in an I-Code.

Local and State Authorities Mandate Regional Building Codes

Local and state jurisdictions set energy building codes for their regions; however, most refer to and adopt the codes set by the commercial and residential IECC. States and municipalities depend on the IECC because of the cost and complexity of developing building codes and standards. All states and the District of Columbia have adopted the IECC, and adapted them to fit their local construction practices, climate, and geography.

https://www.energycodes.gov/infographics

IECC Commercial and Residential Air Barrier Building Codes

The ICC updates the IECC every three years. The newest version was published in 2021 and includes air barrier standards for commercial and residential buildings.

Testing and Performance Requirements for Air Barriers

Air barrier materials must achieve air permeance (air that permeates a material) no more than 0.02 L/(s·m²) at a pressure difference of 75 Pa (0.004 cfm/ft2 at a pressure difference of 1.56 lb/ft2 ) when tested, following ASTM E2178.

Air Barrier Application to Commercial Buildings

Section C402.5.1 of the 2021 IBC states, “A continuous air barrier shall be provided through the building thermal envelope. The continuous air barriers shall be located on the inside or outside of the building thermal envelope, located within the assemblies composing the building thermal envelope, or any combination thereof.” There is one exception: air barriers are not required in buildings located in Climate Zone 2B.

https://basc.pnnl.gov/images/iecc-climate-zone-map

Additionally, the air barrier must comply with Sections C402.5.1.1 and C402.5.1.2:

Section 402.5.1.1

The continuous air barrier shall be constructed to comply with the following:

• The air barrier shall be continuous for all assemblies that are the thermal envelope of the building and across the joints and assemblies.

• Air barrier joints and seams shall be sealed, including sealing transitions in places and changes in materials. The joints and seals shall be securely installed in or on the joint for its entire length so as not to dislodge, loose or otherwise impair it’s ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation. 

• Penetrations of the air barrier shall be caulked, gasket or otherwise sealed in a manner compatible with the construction materials and location. Sealing shall allow for expansion, contraction and mechanical vibration. Joints and seams associated with penetrations shall be sealed in the same manner or taped. Sealing materials shall be securely installed around the penetration so as not to dislodge, loose or otherwise impair the penetrations’ ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation. Sealing of concealed fire sprinklers, where required, shall be in a manner that is recommended by the manufacturer. Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings.

• Recessed lighting fixtures shall comply with Section C402.5.10. Where similar objects are installed that penetrate the air barrier, provisions shall be made to maintain the integrity of the air barrier.

Section 402.5.1.2

A continuous air barrier for the opaque building envelope shall comply with the following:

1. Buildings or portions of buildings, including Group R and I occupancies, shall meet the provisions of Sections C402.5.2.

Exception: Buildings in Climate Zones 2B, 3C and 5C 

2. Buildings or portions of buildings other than Group R and I occupancies shall meet the provisions of Section C402.5.3

Exceptions: 1. Buildings in Climate Zones 2B, 3B, 3C, and 5C. 2. Buildings larger than 5000 square feet (464.5 m2) floor area in Climate Zones 0B, 1, 2A, 4B, and 4C. 3. Buildings between 5,000 square feet (464.5 m2) and 50,000 square feet (4645 m2) floor area in Climate Zones OA, 3A and 5B.

3. Buildings or portions of buildings that do not complete air barrier testing shall meet the provisions of Section C402.5.1.3 or C402.5.1.4 in addition to Section C402.5.1.5.

Residential Structures

The 2021 IRC (Table R402.4.1.1) mandates sealing breaks for joints in the air barrier and a continuous air barrier in the building envelope. IRCs apply to detached one-and-two-family townhouses and dwellings not exceeding three stories above grade plane height. They must also provide a separate means of egress with accessory structures not exceeding three stories above grade in height.

2024 IECC Proposed Changes

Development of the 2024 national model energy codes by the ICC is well on its way. In previous years, the final decisions rested on the votes of government officials. For 2024, two consensus committees (commercial and residential) that represent various stakeholders, will make the decisions. 

The 2024 IECC proposed changes aim to improve overall energy performance compared to the 2021 IECC, with 250 + proposed changes to the commercial energy code and 200 proposed changes to the residential energy code.

The Importance of Certification and Compliance

The current energy codes take cost-effectiveness into account in the latest building science and technology. States and municipalities that routinely adopt the updated codes, along with contractors and architects complying with the codes, can achieve the cost, climate, health, and safety benefits of the IECC International Codes (I-Codes). 

 The I-Codes address air barriers, insulation, HVAC equipment, windows, and other components that enhance occupant health and comfort, lower emissions, and ensure durability. The U.S. Department of Energy predicts that between 2010 and 2040, building energy codes will save the U.S. $138 billion, reduce CO2 emissions by 900 MMT, and lower energy use by 13.5 quads. 

StoGuard® Family of Air and Water-Resistive Barriers for Code Compliance

Sto’s complete system approach offers architects and contractors a one-source solution for the building envelope, including the StoGuard family of air and water-resistive barrier products. The family of products includes a variety of air and water-resistive barrier membranes and StoGuard detail component accessories that can be selected based on the use case, application method, permeability, and substrate.

Thoroughly tested and code compliant against the stringent green construction codes, StoGuard® systems are the superior choice for design professionals who want to apply a single-source, continuous, fully compatible air and water-resistive barrier system to the exterior walls on multi-cladding buildings.

StoGuard® systems comply with the following building codes:

• International Building Code
• International Residential Code
• International Energy Conservation Code
• Los Angeles Building Code
• International Green Construction Code

• CALGreen Title 24 
• ICC 700 National Green Building Standard
• You can find additional codes and standards within ICC-ESR 1233

StoGuard® Systems seamlessly control moisture and air infiltration, which enhances building performance and occupant comfort. The low-VOC StoGuard® family of products includes fully compatible accessories usable with StoGuard® fluid-applied membranes to produce a StoGuard® Air and Water-Resistive Barrier assembly.

Fluid-Applied Air and Water-Resistive Barriers

Sto Gold Coat®

Sto Gold Coat® is a versatile liquid-applied membrane with built-in antifreeze properties, crafted for application on a variety of commonly used surfaces. It is compatible with StoTherm, StoPowerwall, StoQuik, and StoVentec wall systems, and is appropriate for placement behind a range of exterior claddings such as rainscreen, metal, wood, stone, brick, and masonry.

Sto AirSeal®

Sto AirSeal® is a versatile, liquid-applied membrane specifically crafted for medium and high build applications. It is a compatible component of StoTherm, StoPowerwall, StoQuik, and StoVentec wall systems, and is well-suited for application behind a wide range of exterior claddings, including rainscreen, metal, wood, stone, brick, and masonry.

Featuring an impressive 500% elongation and meeting ASTM C1305 Low Temperature Crack Bridging requirements, Sto AirSeal® exhibits exceptional flexibility. Its unique rheology is optimized for high-build installations.

Sto VaporSeal®

Sto VaporSeal® is a Class 1 Vapor Retarder, crafted for application through spray or roller methods on a variety of commonly used surfaces. It is a compatible component of StoTherm, StoPowerwall, StoQuik, and StoVentec wall systems, and is well-suited for installation behind a diverse range of exterior claddings, such as rainscreen, metal, wood, stone, brick, and masonry. With a 500% elongation capability, Sto VaporSeal® meets the stringent requirements of ASTM C1305.

Sto ExtraSeal®

Sto ExtraSeal® is a Portland cement based, trowel applied air barrier. It is specifically designed for use in stucco systems directly applied to poured concrete and masonry substrates.

StoGuard Detail Components

Sto RapidGuard®

Sto RapidGuard® is a single-component, moisture-cured air and water-resistive barrier, along with being a flexible flashing material. It is the recommended StoGuard Detail Component for intricate shapes, including penetrations and complex rough openings.

StoGuard® Conformable Membrane

StoGuard Conformable Membrane is a self-adhesive membrane with a robust no-primer adhesive and a facing membrane that offers an impressive 1470% elongation. It can be installed at a minimum temperature of 20°F. The highly flexible facing membrane easily conforms to intricate shapes commonly found on the building enclosure.

StoGuard® Fabric

StoGuard® Fabric is a durable reinforcement intended for saturation with Sto Gold Coat®, Sto AirSeal®, or Sto VaporSeal® to create a waterproof and flexible flashing material, as well as to treat sheathing joints.

Sto Gold Fill®

Sto Gold Fill® is a pre-mixed product applied with a trowel. StoGuard Mesh is incorporated into StoGuard Fill, forming a waterproof composite material. Combined, they are suitable for treating sheathing joints and providing flashing for rough openings.

StoGuard® Mesh

StoGuard® Mesh is a glass fiber self-adhesive mesh for use with Sto Gold Fill®, available in 4.25- and 9.5-inch widths.

Sto Detail Mesh

Sto Detail Mesh is a coated glass fiber mesh and can be used with Sto Gold Fill. Together they can be used to treat sheathing joints and flash rough openings.

For more on air barrier and building code changes visit our website (link to https://www.stocorp.com/air-water-resistive-barriers/), or contact an air and water barrier expert at Sto® today at (800) 221-2397. 

You can also use energy code compliance software tools, like REScheck and COMcheck, for residential and commercial buildings to determine if your building’s design meets energy code mandates.

The post Air Barrier and Building Code Changes (2018 IECC) appeared first on Sto Corp..

The system provides architects, builders, and developers an ideal solution for restoring the exterior facade of commercial, residential, industrial, and institutional buildings while also improving energy efficiency and durability of the building and allowing for a wide variety of facade aesthetics. EIFS systems also pass ignitability, fire resistance, and intermediate multi-story (NFPA-285) and full-scale multi-story corner tests, both meeting and surpassing the test’s standards.

The design flexibility of EIFS, with a wide range of colors and textures, including wood, brick, stone, concrete and traditional plaster, allows architects to achieve the aesthetic requirements of most restoration projects.

StoTherm® EIFS Wall Systems with Drainage

StoTherm® EIFS cladding systems combine continuous insulation (CI), water- and air-resistant barriers, and a wide variety of finishes to create high-performing, sustainable, and aesthetically pleasing wall cladding. EIFS systems allow for the use of a variety of insulation types: GPS (graphite-enhanced expanded polystyrene), mineral wool, XPS (extruded polystyrene) and EPS (expanded polystyrene). The aesthetically flexible and durable system maximizes curb appeal and saves money through lower energy bills.

Architects and contractors have used Sto products globally for decades for restoration and new construction.

Historical Restoration with EIFS

Sto Products: StoTherm Premier NExT® and StoGuard

The flexibility of StoTherm Premier NExT® EIFS (also known as EIFS-with-Drainage) allowed architects to restore the 100-year-old Lido Beach Towers facade to its former glory while also enhancing its sustainability, energy efficiency, and aesthetics.

EIFS Restoration of a Concrete Block Building

Sto Products: StoTherm®ci, StoCast Wood, Sto® Essence Finish

When the non-profits River Bend Food Bank and FISH of Galesburg, Illinois, set out to restore an old, 15,000 ft2 uninsulated concrete block building for their newest food pantry, they wanted to transform it into a high-performing, aesthetically pleasing structure. Upon the architect’s suggestion, they utilized StoTherm ci EIFS with StoCast Wood and Sto Essence Finish, which significantly improved the building’s thermal performance and overall aesthetics.

Residential Apartment Building Restoration with EIFS

Mocco and Urban Architecture chose the StoTherm® ci EIFS wall system with StoSignature Stone and StoSignature Brick for the restoration of the 333 Grand at Liberty Harbor, an 18-story, 80,000 ft2 multi-family, mixed-use complex with a stunning curved facade, oversized windows, multiple textured surfaces, and vibrant colors. Sto EIFS products ensured an energy-efficient, durable envelope with a significantly lower carbon footprint and greater LEED certification results.

Retail Store Renovation with Sto EIFS

Greenhouse Dispensary utilized the StoTherm ci EIFS system to produce flowing, organic shapes and rescue the building from the architectural mess created by prior additions and renovations of the almost 70-year-old building.

Implementation of this much-admired design included 3D modeling and precision laser cutting of complicated forms that allowed the structure to come together in pieces. The Stolit® Milano finish makes the building shine!

Multi-Family Restoration – Ocean Village

Sto Corp. products revived and improved the former Ocean Village (now the Arverne View), a 1000+ unit apartment, low-income complex in NY, by enhancing its energy efficiency, durability, and curb appeal with StoTherm® ci Lotusan® cladding. The wall system includes three proven components:

• StoGuard®: Fluid applied air and water-resistive barrier,
• StoTherm® ci Lotusan®: Exterior continuous insulation wall system and
• StoLit® Lotusan®: Tintable ultra-hydrophobic textured wall finish with superior self-cleaning properties.

Religious Building Restoration with EIFS

StoTherm® ci Essence (water-drainage EIFS system) provided this unique restoration project with a protective and decorative exterior wall cladding that combined the StoTherm® technology with a StoGuard® waterproof air barrier to improve protection against moisture infiltration and enhance thermal performance and durability.

Sto’s Complete Solution for Building Restoration

Sto has an innovative solution to building facade restoration – the A.R.T. of reStore – aesthetics, repair, and transformation. The A.R.T. of reStore offers all the services and materials needed to maintain and restore your building’s facade. The engineering can also enhance the building’s energy efficiency, safety, and occupant comfort level.

Vast Aesthetic Options

Sto offers aesthetic flexibility of wood, brick, stone, concrete and more, with complete design freedom in endless colors and textures as well as material options. In addition, Sto Studio can help with suggestions on textures, colors, and materials to help restore a building with a high-performing, fully-engineered, sustainable, and beautiful facade.

Sto Studio

Sto Studio will help your architectural design process and ensure that your building restoration will attain its maximum potential. We can generate various color renderings that will help determine the best facade to meet the desired aesthetics of your building.

Sto EIFS – The Best Solution for Restoration

Sto EIFS wall systems, including drainable EIFS, is the best solution for restoring residential, industrial, commercial, or institutional buildings. Sto EIFS cladding systems combine CI, water- and air-resistant barriers, and endless textured finishes to create sustainable, energy-efficient wall cladding. The aesthetically unique and durable system maximizes curb appeal and saves money through reduced energy bills and maintenance costs.

For more on how EIFS offers an ideal restoration solution for improving a building’s energy efficiency and aesthetics, don’t hesitate to contact the Sto professionals at (800) 221-2397!

The post EIFS: Flexible and Energy Efficient, a Great Solution for Restoration appeared first on Sto Corp..

To control moisture in buildings, the walls of a tight building envelope must include vapor, air, water, and water-shedding layers. Fortunately, Sto Corp’s easy-to-install complete wall systems offer builders and architects these layers in complete systems to effectively ensure optimal moisture control.

Sto perfect wall envelope solutions include all five planes of control needed to protect the building and create energy-efficient, durable, safe, and sustainable buildings while still providing an aesthetic appeal: vapor, air, water, thermal, and water-shedding control layers.

Why Buildings Need Moisture Control

High-quality moisture control in buildings will protect the occupants from adverse health effects and will also protect the building’s integrity. Moisture control can prevent costly maintenance, repairs, and replacement of the claddings.

Health Implications of Damp in Buildings

A report by the Committee on Damp Indoor Spaces and Health found strong evidence that exposure to moist indoor environments had adverse health effects, including:

• Upper respiratory (throat and nasal) symptoms.
• Cough and wheeze
• Asthma symptoms in sensitized persons with asthma

Furthermore, the committee found suggestive evidence of an association between exposure to moist indoor environments and:

• Dyspnea (shortness of breath)
• Lower respiratory illness in otherwise healthy children
• Asthma

Moisture Damage in Buildings

Moisture can significantly damage building materials and components:

• Water-soluble building materials (e.g. gypsum board) may lose their structural integrity, and become soft and weak when exposed to water.
• Damp conditions can lead to mold, bacteria, and pests (e.g., ants and termites) within the building materials and HVAC systems.
• Corrosion can occur when water combines with oxygen on two metal surfaces, like structural fasteners, wiring, and metal roofing, and can cause the systems to fail.
• Wood products can warp, rot, and swell.
• Freeze/thaw cycles and sub-surface salt deposition can damage brick and concrete.
• Moisture reduces the insulating value (R-value) of thermal insulation.

Features of a Moisture Controlling Building Envelope

A building envelope designed to control moisture intrusion and accumulation should provide the following features:

Control Water

Moisture control in a building must sufficiently keep water from infiltrating the entire building assembly, including roofs, walls, and foundations. The building design should:

• Drain the site by sloping the grade away from the building by diverting surface water from the foundation. In addition, apply a stormwater runoff system to direct rain from the roof into the site drainage system.
• Keep water from leaking into the walls and roof with exterior cladding, roofing, and stormwater management systems to intercept and drain the rain away from the building.
• Locate plumbing lines and components in areas not prone to freezing and not in contact with porous cavity insulation. In addition, keep up with regular maintenance by placing plumbing so you can easily and quickly inspect and repair it.
• Include a capillary break to keep rainwater from wicking through gaps, cracks, or porous building materials.
• Protect moisture-sensitive and porous materials during transport and on-site storage against moisture to avoid enclosing wet materials in new construction.

Limit Condensation

Minimize condensation in the building envelope by limiting indoor humidity and water vapor migration by diffusion and airflow. To limit condensation, the building design should:

• Include a continuous air barrier system around the entire enclosure
• Manage the water vapor and heat flow through enclosure assemblies to avoid condensation on the drainage plane’s materials inboard.
• Follow the 2021 IECC residential and commercial buildings’ thermal building envelope code mandates:
  • The 2021 residential International Energy Conservation Code (IECC) Section R402.4 requires the building’s thermal building envelope shall limit air leakage according to Sections R402.4.1 through R402.4.5.
  • The 2021 commercial IECC Section C402.5 mandates that the thermal envelope of buildings shall comply with Sections C402.5.1 to C402.5.8.

Use Moisture-Resistant Building Products

Builders should use moisture-tolerant materials, particularly in areas prone to getting wet, like bathrooms, kitchens, laundry rooms, etc.

Achieving Moisture Control in Buildings with Sto Corp

Sto Corp. wall systems provide architects, general contractors, and developers with innovative building envelope technology to control moisture and create sustainable, durable, energy-efficient, and healthy walls with unique and beautiful aesthetics. Sto’s complete wall systems include all the layers required for a high-performance building envelope system that controls moisture: vapor control, air control, water penetration, thermal control, and durable-water shedding layer.

Sto Vapor Permeable Water-Resistive Barrier

A vapor-permeable water-resistive barrier (WRB) under the siding protects walls from vapor, rain, snow, and ice. The WRB must also furnish a way for moisture accumulating in the wall cavity to diffuse through the system and dry. WRBs often function as a structure’s air barrier.

Three principles typically mandate how to control water flow through a building envelope (and its removal) once inside the envelope:

1. Deflect the water with a properly installed water-resistive barrier and cladding.
2. Apply drainage mats that form drainage cavities to direct the water away from the building envelope.
3. Include a WRB with enough permeability so that the wall system quickly dries.

The most effective perm rating for a WRB stops water from infiltrating the wall cavity and allows infiltrated moisture vapor to escape.

• Too high a perm will allow moisture outside to infiltrate the wall system.
• Too low a perm will trap the water within the wall cavity.

The ideal WRB perm for balancing the outward and inward moisture flow within the building envelope falls between 10 and 20 perms. However, the positioning within the wall assembly and climate also affects the WRB permeability.

Sto’s Air Control Layer

A high-quality building envelope stops air transfer (and the moisture contained) between the exterior and interior to regulate the indoor climate. An air barrier must stand up to the differences in air pressure by limiting heat gains and losses through convection, conduction, and radiation. Additionally, air barriers must stop air from transporting moisture to the wall system’s interior to prevent condensation and the damaging effects of moisture and mold.

Vital components of a high-quality air barrier include:

• Continuous over the entire building’s envelope
• Impermeability to airflow
• Structural integrity (durability) over the building’s lifetime

The air barrier should also have the stiffness and strength to withstand forces acting on them during and after construction.

StoGuard® Family of Air and Water-resistive Barriers

Like all Sto wall assemblies, the StoGuard® family of air and water-resistive barrier products provide the initial protection against moisture and air infiltration.

StoGuard® Systems provide seamless control over moisture and air to enhance occupant comfort and building performance. The StoGuard family of products include a set fully compatible accessories that can be used with StoGuard fluid-applied membranes to create StoGuard Air and Water-Resistive Barrier system:

• Sheathing joint treatments that feature a single component, quick-drying multi-use air barrier and waterproof product, a self-adhered membrane, one component fabric or mesh-based solutions that are designed for sheathing protection and seamless joint treatment.
• Fluid-applied water and air-resistive barriers that produce a seamless barrier to resist moisture infiltration and condensation and improve a building’s energy efficiency.
• The StoGuard® System offers superior-seamless rough opening protection in a variety of products including a single component, fast-drying multi-use air barrier, a self-adhered membrane and a mesh-based product.
• A versatile transition membrane for detailing areas to furnish flexible connections and continuity of the air barrier system.

Sto Water-Shedding Control Layer

Managing rainwater intrusion into a building envelope must consider all forces (capillary action, gravity, and wind pressure differences) that drive the water and the components needed to combat and regulate these forces.

Components that control water include:

• Horizontal and vertical plane changes
• A well-defined drainage path
• A continuous watertight membrane
• Flashing systems

A cavity wall (screen wall or drainage) provides a drainage plane and concealed open-air space.

Drainable EIFS StoTherm® ci Wall Systems

Renovation of this multi-family structure utilized StoTherm® ci with StoSignature Stone & StoSignature Brick.

Drainable EIFS StoTherm® ci Wall Systems combine drainage, continuous insulation, and an air and water-resistive barrier, to produce a durable and energy-efficient wall system that saves money on utilities, maintenance, and repairs. Sustainable StoTherm® ci wall systems improve indoor air quality and comfort. The StoTherm® Wall System comes in various textured finish options to meet all aesthetic and architectural needs.

Sto’s Thermal Control Layer

Controlling moisture within a building envelope requires continuous insulation (CI) across all building components, without thermal bridges other than fasteners and service openings. Minimizing or eliminating thermal bridging protects the insulation’s R-value. CI controls thermal heat transfer and lessens condensation and temperature fluctuations.

StoVentec® Rainscreen® Systems Furnish Continuous Insulation

StoVentec® Rainscreen® Systems provide a complete solution in a fully-tested, back-ventilated, and code-approved system. In addition, the simple-to-install Rainscreen® system offers thermally efficient CI to limit damaging condensation and reduce the cost of heating and air conditioning.

Its structural frame also improves safety against fire and wind loads. Architects can finish StoVentec® Rainscreen® Systems with traditional masonry, glass, or plaster cladding. Sto’s expansive design flexibility offers many colors, textures, shapes, and materials to fit the needs of any architectural and aesthetic design.

Sto Promotes Durable Building Envelopes

White Castle built their largest restaurant with StoTherm® ci and StoTherm® ci MVES with stone.

A building envelope’s long-term durability and performance depend on its resistance to mold, decay, freeze damage, and corrosion. Building envelopes can fail due to material problems, design flaws, poor workmanship, etc. Selecting simple-to-install and durable products, like StoPanel® MVES ci, will help protect a building envelope’s long-term performance.

StoPanel® MVES ci includes:

• High-strength masonry veneer (thin brick, cultured stone, natural stone, porcelain and ceramic tile)
• A continuous air and water-resistive barrier
• An engineered insulating wall system

The all-in-one system creates a weather and air-tight wall system with superior durability and thermal performance.

StoQuik® Silver Cement Board Stucco

Straightforward and fast to install StoQuik® Silver DrainScreen® Systems combine various components into one system to produce a moisture-resistant, high-impact exterior wall finish that quickens delivery time and reduces labor costs compared to traditional stucco:

• Provides moisture protection with an air and water-resistive barrier
• A drainage mat to drain and dry
• Versatile design and performance options of Sto’s numerous textured finishes
• Cement board substrate for impact resistance

Sto Finishes

Sto offers a wide selection of finishes in a variety of aesthetics and textures and an extensive range of color options to enhance your design and harmonize with the surrounding environment. Sto Finishes are durable, resist dirt and water, and are manufactured to high quality standards. They serve to protect the building in addition to providing outstanding curb appeal.

Hurricane Impact Systems

Sto Hurricane Impact (HI) Systems offer high-impact protection for coastal construction prone to hurricanes, tropical storms, wind-borne debris, and water infiltration – events that lead to building envelope failure. Sto HI systems meet the strict Miami-Dade County, Florida NOA mandates for water and air infiltrations, wind load resistance, and impact resistance.

Sto Corp Systems Offer Moisture Control in Buildings

Quick and straightforward to install, Sto Systems offers contractors, architects, and developers a tested and innovative high-performance building envelope solution to controlling moisture infiltration and accumulation. Sto’s single-product wall systems deliver on all performance needs, save time and money, and reduce labor, risk, and complexity compared to systems that need many components from multiple sources. To learn more about Sto’s engineered wall systems, download The Case for Engineered Building Enclosure Systems.

Independent testing shows that Sto systems control moisture by meeting water infiltration and ventilation performance specifications, water resistance, wind load resistance, impact resistance, flame spread, and accelerated weathering.

Contact us today for more on moisture control in buildings to create a durable, sustainable, and safe building envelope.

The post Achieving Moisture Control in Buildings appeared first on Sto Corp..

StoTherm® ci is a single-source, fast-to-install approach to commercial construction. It combines CI, water and air-resistive barrier, drainage, and many finish options to create a high-performing, sustainable, attractive wall cladding. The durable and unique system will help create a more sustainable society for future generations.

Why We Need Airtight Buildings

In the U.S., commercial buildings account for 19 percent of the primary energy consumed. Constructing airtight buildings will save money and combat fossil fuel dependency. Airtightness also reduces CO2 emissions, a known cause of global change and climate change.

Achieving Airtightness in Buildings with Air Barriers

Air barriers include one or more products that create a continuous plane around a building or home, to prevent uncontrolled air, moisture, and heat flow in and out of the building envelope. The building enclosure includes the above- and below-grade components that physically separate the structure’s interior and exterior environments.

High-Performing air barriers should include these four vital components:

1. Continuous over the entire building enclosure

2. Airflow impermeability

3. The stiffness and strength to resist forces acting on them during and after construction

4. Structural durability over the expected lifetime of the structure

When tested according to ASTM E 2178, an air barrier’s air permeance should not exceed 0.02 L/(s·m²) at a pressure difference of 75 Pa (0.004 cfm ft2 at a pressure difference of 1.56 lb ft2). Air permeance represents air flow through a material. In contrast, air leakage flows through holes and gaps.

Air Barrier Code Requirements

The International Building Code (Section C402.5.1) and International Residential Code (Table R402.4.1.1) list code requirements for commercial and residential structures.

Five Tips for Achieving Airtightness in Buildings

Architects, builders, and developers can achieve airtightness in buildings by utilizing innovative materials and methods.

1. The Whole-Building System Approach to Airtight Buildings

Implementing the whole-building system approach treats a building as a single energy system, where each component impacts the entire building’s airtightness and efficiency. During the design phase, the building team works together to select construction materials and systems that maximize airtightness and minimize energy use throughout the building envelope.

2. Install an All-In-One Continuous Insulation Wall System

Achieving airtightness requires CI in the exterior walls. The ASHRAE 90.1 and the 2021 IECC require CI, as defined in the ASHRAE 90.1-2010.

Fortunately, energy-efficient, code-compliant exterior insulation and finish systems (EIFS), like StoTherm® ci Wall Systems Drainable EIFS, provide a superior solution for achieving CI and air tightness.

StoTherm® ci Wall Systems Drainable EIFS

StoTherm® ci facade systems combine continuous insulation (CI), air and water-resistive barrier, drainage, and various surfaces and textured finishes to create a sustainable wall system. The unique and durable system saves money by minimizing energy bills and sustains curb appeal. Sto offers a variety of StoTherm® ci cladding systems to meet every need:

StoTherm® ci

StoTherm® ci includes the StoGuard® air and water-resistive barrier system and energy-efficient EPS insulation.

StoTherm® Mineral ci

The StoTherm® ci Mineral System includes a non-combustible mineral wool exterior CI and air and water-resistive barrier with Sto’s quality finishes.

StoTherm® ci XPS

StoTherm® ci XPS combines high R-value XPS insulation into the wall system and StoGuard® fluid-applied air and water-resistive barrier.

StoTherm® ci MVES

The StoTherm® ci MVES (masonry veneer engineered system) features manufactured masonry veneer in cultured stone, thin brick, natural stone, and ceramic tile, fully integrated seamless air and water-resistive barrier, and either EPS or XPS insulation.

StoTherm® ci HI-LM 180

The energy-efficient StoTherm® ci HI-LM 180 CI wall system includes StoTherm® insulated cladding, StoGuard® waterproof air and water-resistive barrier, and drainage over concrete masonry unit substrates. StoTherm® ci HI-LM 180’s engineering achieves the testing requirements for large and small missile impacts.

StoTherm® ci 1177- LM

StoTherm® ci 1177- LM exterior wall cladding provides seamless air and moisture resistance with CI, advanced drainage, and Sto Armor Mat XX Mesh for additional impact resistance and reinforcement over glass mat gypsum sheathing. StoTherm® ci 1177-LM meets the testing requirements for large and small missile impacts.

StoTherm® ci 1177-SM

The StoTherm® ci 1177-SM exterior wall cladding system includes seamless continuous insulation, air and water-resistive barrier with advanced drainage capabilities over glass mat gypsum sheathing.

StoTherm® ci HI-PLY

StoTherm® ci HI-PLY exterior wall cladding combines seamless moisture and air barrier with CI and advanced drainage over CDX exterior plywood sheathing.

3. Insulated Roofs

High-performing roofing insulation reduces heat loss during the winter by 25 percent. It also minimizes moisture intrusion through the roof and stops the growth of unhealthy and structurally damaging mold. In addition, cool and insulated roofs lower energy bills and enhance the building’s indoor environmental quality.

4. Windows and Doors for Airtightness

About 20 percent of heat loss happens through cracks in doors, skylights, and windows. Achieving airtightness should include ENERGY STAR-certified skylights, windows, and doors, to reduce heat loss by 25 to 50 percent. In addition, darkening windows can control glare and brightness from direct sunlight, and shades and louvers can block out the summer’s heat, but let the warmth in during the cold months.

5. Building Energy Modeling (BEM)

Building Energy Modeling (BEM) helps architects and builders achieve airtightness. BEMs use project-specific features like creating orientation, window location, weather, building methods and materials, and more. BEMs help to estimate a building’s energy efficiency and to meet energy codes. The BEM can also minimize building costs by identifying insulation levels needed to achieve performance targets cost-effectively and offset an expensive, higher-quality envelope by requiring a smaller HVAC system.

Achieve Airtightness in Buildings with Sto Building Products

Achieving airtightness in buildings requires architects, buildings, and developers to incorporate innovative methods and materials, like StoTherm® ci cladding systems.

An energy-efficient, code-compliant, durable, and attractive StoTherm® ci Wall System is a superior wall solution for achieving airtightness in buildings. Check out our Georgia King Village Case Study for a great example.

Contact our experienced representatives today at 1-800-221-2397 for more on how to achieve airtightness in buildings. To learn more about the benefits of using a building enclosure system, download, “The Case for Engineered Building Enclosure Systems“.

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Some of the factors that architects and builders often consider when deciding between sheet-applied and fluid-applied weather barriers include:

• Managing water vapor with an air barrier
• Building geometry
• Substrate materials
• Project conditions
• Weather conditions
• Climate
• Time

Read on to learn more about liquid-applied air barrier systems, like Sto Fluid-Applied Air and Moisture Barriers and StoGuard Detail Components, and the benefits and concerns of these systems.

Fluid-Applied Membrane Air Barriers

A fluid-applied membrane air barrier is a monolithic coating that bonds to the exterior sheathing without fasteners. A high-performing fluid-applied vapor barrier contributes to energy-efficient, durable, and healthy residential, commercial, and institutional environments.

The Benefits of Fluid-Applied Air Barriers

Fluid-applied air and water-resistive barriers provide many benefits that save money and time and help preserve the integrity and health of a building:

Allows for Complex Detailing

A liquid air barrier efficiently adheres to and waterproofs various wall conditions (e.g., penetrations, fasteners, repair locations, and detail wall openings) and conforms to uneven substrates. In contrast, sheet-applied air and moisture barriers require cutting, folding, lapping, and sealing.

A liquid vapor barrier quickly and easily adapts to complex architectural substrate geometry.

Fast Application

A qualified installer can quickly spray or roll the air and water-resistive barrier membrane onto the wall substrate to save money and time.

A spray-applied vapor barrier does not require a primer, which saves even more time.

Air Barrier

A fluid-applied water resistive barrier (WRB) stops air leakage, reduces energy costs and condensation, and improves occupant comfort.

Moisture Barrier

A liquid-applied vapor barrier creates a seamless moisture barrier by minimizing installation errors that can cause tears, holes, or lap joints.

Wind Barrier

A liquid-applied WRB provides structural and full adherence, for rigidity and stability against severe wind events.

Durable

A liquid moisture barrier will not lose its effectiveness when exposed to outdoor elements during and after construction. Checking with the manufacturer’s recommendation for length of exposure.

Lessens Repairs

A fluid-applied moisture barrier membrane protects the rough openings and sheathing from weather damage during and after construction, which lessens replacement or repair expenses.

Safe

Safe to use, V.O.C. compliant water-based air and vapor barriers are easily cleaned up.

Rainwater Barrier

Liquid-applied barriers for pressure-moderated or pressure-equalized wall design will reduce the risk of rainwater penetration through the wall assembly.

Problems with Fluid-Applied Air Barriers

Fluid-applied air barriers require a professional-quality application and dry conditions to ensure their performance.

Requires Skilled Labor

A fluid-applied air and moisture barrier typically requires experienced and professional installers capable of applying the barrier, as they need to use a specialized spray gun, at a constant, steady rate to ensure consistent thickness and adequate coverage at detail interfaces.

The air and barrier’s performance depends on hiring qualified and skilled installers that carefully follow the manufacturer’s instructions, which is a complex task with today’s shortage of skilled labor.

Sto Gold Coat, Sto AirSeal, Sto VaporSeal do not have to be spray applied. They can also be applied with a roller. Therefore, the skill level required for application is not a problem. Sto ExtraSeal, in particular, is a trowel-applied product.

Sto Detail Components and Fluid-Applied Air and Moisture Barriers

The StoGuard® System includes vapor permeable air barrier or impermeable fluid-applied membranes, depending on climate and wall design: Sto Gold Coat®, Sto ExtraSeal®, Sto AirSeal®, and Sto VaporSeal – all function as waterproof air barriers when used with StoGuard Detail Components.

StoGuard Detail Components

StoGuard detail components, in combination with Sto fluid-applied membranes, provide durable, continuous water and air-resistive barriers at critical areas like movement joints, penetrations, substrate transitions, transitions to rough openings, roofing, and below-grade air barriers. Builders typically apply Sto Detail components and then overcoat them with the fluid-applied membrane.

Sto RapidGuard

Single-component, vapor-permeable Sto RapidGuard® is an above-grade wall construction multi-use air barrier and waterproof material. Easy-to-use, flexible, and fast-drying Sto RapidGuard® provides high-quality air and moisture protection on CMU, concrete, brick masonry, gypsum sheathing, wood, galvanized metal, and cement-based sheathings.

Applications: seal rough openings, seams, sheathing joints, cracks, and transitions.

StoGuard® Conformable Membrane

Self-adhered StoGuard Conformable Membrane (in 4-inch, 6-inch, and 9-inch widths) features an aggressive no-primer adhesive and a facing membrane that offers 1470 percent elongation. The high-elongation facer membrane readily conforms to complex shapes found on the building enclosure. Only apply StoGuard Conformable Membrane at a temperature above 20°F.

Applications: Sheathing joints and corners, dynamic joints, seams, static joints, penetrations, and flashings and rough opening protections.

StoGuard® Fabric

Tough StoGuard® Fabric (in 4-inch, 6-inch, and 9-inch widths) saturates with Sto Gold Coat®, Sto AirSeal®, or Sto VaporSeal® to produce a flexible, waterproof flashing material and sheathing joint treatment.

Applications: Penetrations, sheathing joints and corners, flashing, and rough opening protections.

StoGuard® RediCorner

Preformed StoGuard® RediCorner fabric installs quickly on the rough openings of a sheathing joint’s inside and outside corners. Builders can use it as part of the StoGuard® assembly with either Sto Gold Coat®, StoGuard® VaporSeal, or Sto EmeraldCoat®.

Sto Gold Fill®

Ready-mixed, trowel-applied Sto Gold Fill® embeds StoGuard Mesh to create a waterproof composite material.

Applications: Penetrations, rough opening protections, and sheathing joints and corners.

StoGuard® Mesh

Builders can use self-adhesive, glass fiber, StoGuard® Mesh with Sto Gold Fill®, Available in 4.25- and 9.5-inch widths.

Sto Detail Mesh

Builders can use coated glass fiber Sto Detail Mesh with Sto Gold Fill to treat sheathing joints and flash rough openings.

Sto Fluid-Applied Air and Moisture Barriers

Sto Gold Coat® Permeable Vapor Barrier

Vapor-permeable, ready-mixed, and flexible Sto Gold Coat® is a flexible fluid-applied membrane designed for installation on most commonly used substrates. It can be used as part of StoTherm, StoPowerwall, StoQuik and StoVentec wall systems, and is suitable for use behind most exterior claddings including rainscreen, metal, wood, stone, brick, and masonry. It applies with a roller or sprays directly to vertical above-grade wall sheathing and concrete masonry, and functions as a waterproof air barrier when used with StoGuard Detail Components.

Sto ExtraSeal® Vapor Permeable Membrane

Vapor-permeable, trowel or spray-applied Sto ExtraSeal® is a portland cement-based moisture and air-resistant barrier that is applied over prepared above-grade concrete and concrete masonry (CMU) walls beneath StoPowerwall® and other Sto-listed ASTM C926 stucco brown coats. In addition, it provides substrate water and air leakage resistance.

Sto AirSeal®

Sto AirSeal® is a flexible, fluid-applied membrane designed for installation to commonly used substrates beneath most exterior claddings. It can be used as part of StoTherm, StoPowerwall, StoQuik and StoVentec wall systems, and is suitable for use behind most exterior claddings including rainscreen, metal, wood, stone, brick, and masonry. Sto AirSeal® features 500% elongation and meets ASTM C1305 Low Temperature Crack Bridging requirements. The unique rheology of Sto AirSeal is optimized for high-build installation.

Sto VaporSeal

Sto VaporSeal® is a Class 1 Vapor Retarder designed for spray or roller installation to most commonly used substrates. It can be used as part of StoTherm, StoPowerwall, StoQuik and StoVentec wall systems, and is suitable for use behind most exterior claddings including rainscreen, metal, wood, stone, brick, and masonry. Sto VaporSeal® features 500% elongation and meets requirements of ASTM C1305.

Why Choose Sto Fluid-Applied Air and Moisture Barriers Products?

Sto’s roller or spray-applied family of fluid/liquid-applied air barrier products give architects and builders a superior solution to their weather barrier design and application challenges. Our easy-to-apply products save money and time during the application process and maintain their integrity for the builder’s lifetime.

Contact our Sto professionals today for more on fluid-applied air and moisture barriers and detail components.

The post Fluid/Liquid-Applied Air & Moisture Barriers appeared first on Sto Corp..

Together, weather barriers provide several vital functions to the building envelope:

• Air – Prevents excessive air infiltration
• Condensation – Resists condensation within the wall system
• Water – Resists liquid water penetration
• Energy Conservation – Resists thermal transfer through convection, conduction, and radiation
• Movement – Accommodates differential movement (caused by moisture, seasonal or daily temperature shifts, and structural movement)

Three Simple Differences Between the Four Building Envelope Restrictive Barriers

1. Air Barrier vs. Vapor Barrier

• • Air barriers restrict airflow (and the water attached) through a material. Air barriers can be either vapor permeable (allowing water vapor to pass through) or vapor impermeable
  • Vapor barriers restrict the flow of water vapor (diffusion) through materials.

2. Water Barrier vs. Vapor Barrier
   • Moisture barriers may be either vapor permeable or vapor impermeable. Installing moisture barriers on the wall’s exterior stops bulk water from infiltrating the wall cavity while allowing water vapor to pass, helping to dry out the wall assembly if any incidental moisture should occur.
   • Installing a vapor barrier on the frame’s interior, between the studs and drywall, stops vapor from the structure’s interior from infiltrating the wall system and condensing on the warm side of the insulation.
3. Weather Barrier vs. Vapor Barrier
   • Weather barriers prevent moisture, rain, and wind from passing through the building envelope. However, they also allow water within the wall system to dry quickly.
   • Vapor barriers only limit water vapor (diffusion) flow through a material.

A Better Wall Solution to Conventional Vapor and Air Barriers

Traditionally, the tedious work of installing air and vapor barriers would cost builders time and expensive labor, with dire consequences if one system failed. Fortunately, Sto Corp.’s building envelope solutions include all five planes of control required for a high-quality building envelope system: air, vapor, thermal, durable water-shedding, and water-penetration control layers. Sto’s wall systems ensure energy-efficient, durable, safe, and sustainable structures with unique aesthetic appeal.

In addition, our StoGuard® liquid-applied air and moisture barrier products are a vital component of all Sto high-performance wall systems that help to seal the building envelope.

Air Barrier vs. Vapor Barrier Installations: What is the Difference?

Understanding the differences in air and vapor barriers can help ensure moisture-resistant, vapor-resistant, and airtight building envelopes – vital features of a durable, healthy, energy-efficient, and comfortable home or building.

What is an Air Barrier?

Air barriers include one or more products that form a continuous plane around a home or building to stop uncontrolled air, heat, and moisture flow in and out of the building envelope components. The building enclosure includes the above- and below-grade elements that physically separate the exterior and interior environments of the house or building.

The building enclosure includes three interactive components (an enclosure system and the interior and exterior environment) and five structural systems:

• Base floor
• Below-grade wall
• Above-grade wall
• Windows, skylights, and doors
• Roof

The Design of an Effective Air Barrier

An air barrier design manages air, moisture, heat, and solar radiation movement by effectively controlling the interactions between the building’s physical elements, the environment, and its occupants.

A quality air barrier system limits heat losses and gains through conduction, convection, and radiation:

• Thermal conduction happens when warmer molecules move towards colder molecules. The effective R-value of a wall system represents its resistance to conduction.
• Thermal convection happens when heat energy from a hotter area flows to a cooler place by moving fluids (usually gas and liquids).
• Thermal radiation transfers heat from warmer spaces to cooler spots by electromagnetic waves (mainly the Sun’s radiation).

High-quality air barriers should provide these four crucial components:

1. Continuous over the entire structure’s building enclosure
2. Impermeable to airflow
3. The strength and stiffness to withstand forces acting on them during and following construction
4. Structural durability (integrity) over the expected lifetime of the building or home

When tested according to ASTM E2178, an air barrier’s air permeance should not surpass 0.02 L/(s·m²) at a pressure difference of 75 Pa (0.004 cfm per square foot at a pressure difference of 1.56 lb per square foot). Air permeance represents the amount of air that flows through a material. In contrast, air leakage flows through gaps and holes.

Why Building Envelopes Need an Air Barrier

Air barriers control the indoor climate by preventing airflow between the exterior and interior of a building or home. In addition, air barriers stop air transported moisture to the interior of a wall cavity. Controlling air and moisture infiltration provides several significant benefits:

• Lowers building energy usage, which saves money and protects the environment
• Limits moisture in the wall cavity, preventing the growth of structurally damaging rot and mildew
• Improves occupant comfort and improves their productivity by stabilizing temperatures and eliminating drafts
• Improves indoor air quality by stopping the growth of unhealthy mold

Air Barrier Code Requirements

The International Building Code (IBC) and International Residential Code (IRC) provide code requirements for commercial and residential buildings.

Commercial Buildings

The 2021 IBC, Section C402.5.1, requires a continuous air barrier all around the building envelope for commercial structures (except climate zone 2B). Furthermore, builders can place air barriers outside or inside the building envelope, within the envelope assemblies, or any combination thereof. The air barrier must comply with Sections C492.5.1.2 and C402.5.1.1.

The IBCs apply to all structures and buildings that do not conform to the mandated provisions of the IRC.

Residential Buildings

The 2021 IRC (Table R402.4.1.1) requires installing a continuous air barrier in a building envelope and sealing breaks in its joints.

IRCs apply to detached one-and-two-family homes and townhouses no more than three levels above grade plane height. Additionally, they should have a separate means of egress with accessory structures no more than three stories above the grade plane in height.

What is a Vapor Barrier?

Vapor barriers limit or stop vapor diffusion, a process where moisture flows from a space of greater moisture concentration toward an area of lower concentration. It can also occur when moisture moves from a warmer to a cooler place within a building material, like insulation. Vapor barriers prevent diffusion, while vapor retarders only slow vapor diffusion.

The ASTM E96 desiccant method determines a building material’s ability to limit moisture from flowing through it, giving it a vapor retarder (barrier) class:

• Class I vapor barrier – 0.1 perms or less
• Class II vapor retarder – 0.1 < perm <1.0 perm
• Class III vapor retarder – 1.0 < perm <10 perm

Why Building Envelopes Need Vapor Barriers

Structural systems susceptible to direct contact with water require a vapor-resistant barrier. However, Sto Corp. recommends you contact your building inspection office for local guidance on using vapor barriers.

Builders often place vapor barriers on the interior wall and ceiling insulation to keep the warmer air inside a building from flowing towards the cool air within the wall assembly during winter.

Above-Grade Vapor Barriers

Building experts typically recommend installing vapor barriers on the wall’s more hot and moist side – the inner surface in cooler climates and the outer surface in humid, hotter climates. Examples of application of vapor barriers include:

• Placing polyethylene plastic vapor barriers between the insulation and interior wallboard in cold climates will help control moisture accumulation.
• Placing a vapor barrier in areas with high humidity, like bathrooms, will help manage condensation.
• An exterior vapor barrier in humid and hot climates can help keep outside humidity from infiltrating walls.

Below-Grade Vapor Barriers

• Placing a polyethylene moisture barrier over the exposed earth in crawl spaces will help manage moisture intrusion.
• Below-grade walls and floor slabs transmit ground moisture through concrete walls and slabs. Therefore, place a vapor barrier against the concrete surface to stop moisture infiltration before installing wood framing.

Code Requirements for Vapor Barriers

The need for a vapor barrier on a building’s exterior or interior depends on the climate zone. The 2021 International Building Code (IBC) 1404.3 and 2021 International Residential Code (IRC) R702.7 mandate Class I or II vapor retarders and barriers on the framed walls’ interiors in climate zones Marine 4 and 5,6,7, and 8. However, climate zones 1, 2, and 3 do not require vapor barriers and retarders.

The Perfect Wall

Building Science Corporation first noted the idea of “The Perfect Wall” in 2010.

Sto Corp.’s building envelope solutions focus on performance and aesthetics. By including all five planes of control, Sto’s wall systems create energy-efficient, durable, safe, and sustainable structures with unique aesthetic appeal that will include: air, vapor, thermal, durable water-shedding, and water-penetration control layers.

• The Vapor Permeable or Impermeable Control Layer, per designer specification, controls the water vapor flow from areas of high to low pressure to minimize condensation.
• The Air Control Layer limits the uncontrolled air flow through the wall system to reduce condensation and energy loss.
• The Water Penetration Control Layer provides an inbound barrier of the cladding, flashed to the exterior, to stop liquid water from entering the wall cavity.
• The Thermal Control Layer provides insulation to lessen thermal bridging significantly.
• A Durable Water Shedding Layer offers a functional finish surface connected to a resilient lamina to protect against and divert water away from the wall.

StoGuard® Fluid-Applied Air and Water-resistive Barrier System

StoGuard® fluid-applied air and water-resistive barrier products provide a key component of all Sto high-performance wall systems, helping to seal the building envelope and providing several significant benefits:

• Wall system air leakage below 0.04 cfm/ft2 at 1.57 psf (0.2 L/s•m2 at 75Pa) when tested following ASTM E2357
• Potential savings of 40 percent in heating and cooling costs
• Low CO2 emissions

The StoGuard® System includes either vapor-permeable or impermeable fluid-applied membranes to accommodate all climate and wall designs and provide the first line of protection and seamless control over air and moisture infiltration, to improve building performance and occupant comfort.

Water-based, fluid-applied, quick, and easy-to-install StoGuard air and water-resistive barriers form a fully-adhered, seamless monolithic moisture and air barrier on the exterior wall. They effectively protect against moisture infiltration and unwanted air movement for the lifetime of the building.

StoGuard® barriers do not tear and lose adhesion, like housewrap, which minimizes costly callbacks or even long-term system failure. In addition, characteristics of StoGuard® simplify the application process, installing in much less time compared to building wrap:

• You can apply StoGuard® liquid membranes with a roller or airless spray, which increases the speed of application on the wall while simplifying integration with other wall system components.
• StoGuard® systems include various interchangeable detail components that allow for continued protection on the wall regardless of the site conditions or complex design features.

Sto Fluid-Applied Air and Moisture Barriers

The StoGuard® System includes vapor-permeable or impermeable fluid-applied membranes, depending on climate and wall design.

Sto Gold Coat®

Vapor-permeable, flexible fluid-applied membrane designed for installation on most commonly used substrates. It can be used as part of StoTherm, StoPowerwall, StoQuik and StoVentec wall systems, and is suitable for use behind most exterior claddings including rainscreen, metal, wood, stone, brick, and masonry.

Sto AirSeal®

Builders can use vapor permeable, roller, and spray fluid applied Sto AirSeal® behind StoVentec RainScreen®, StoTherm® ci, StoPowerwall®, StoQuik® Silver and above-grade walls behind claddings (e.g., brick stucco, metal panels, cement board). It applies over prepared vertical above-grade wall substrates like concrete masonry, concrete, plywood, OSB sheathing, and glass mat gypsum.

Sto VaporSeal

Class 1 Vapor Retarder designed for spray or roller installation to most commonly used substrates. It can be used as part of StoTherm, StoPowerwall, StoQuik and StoVentec wall systems, and is suitable for use behind most exterior claddings including rainscreen, metal, wood, stone, brick, and masonry. Sto VaporSeal® features 500% elongation and meets requirements of ASTM C1305.

Sto’s detail components include:

StoGuard RediCorner – Transition Membrane

Sto RapidGuard® is a single-component, moisture-cured, damp surface tolerant air and water-resistive barrier component and flexible flashing material. It is the preferred StoGuard Detail Component for complex shapes such as penetrations and complex rough openings.

StoGuard Fabric – Sheathing Joint Treatments

StoGuard® Fabric 4″ is a non-woven cloth reinforcement. As part of the StoGuard® assembly, you can use it with either Sto Gold Coat®, StoGuard® VaporSeal®, or Sto AirSeal to treat sheathing joints, rough openings, and inside and outside corners.

StoGuard® Conformable Membrane is a self-adhered membrane featuring an aggressive no-primer adhesive and a facing membrane that provides 1470% elongation. Minimum installation temperature is 20°F. The high-elongation facer membrane readily conforms to complex shapes found on the building enclosure.

Why Choose Sto Products for Air and Vapor Barrier Installations

Sto Systems provides architects, contractors, and developers with a quick, straightforward-to-install, tested, and cutting-edge, high-performance building envelope. Sto’s high-performance wall systems and StoGuard® air and water-resistive barrier system deliver on all performance needs, including air and vapor barriers, by saving money and time and reducing labor, risk, and complexity compared to systems with multiple components.

Independent testing shows that Sto systems meet water infiltration and ventilation performance specifications, impact resistance, wind load resistance, water resistance, accelerated weathering, and flame spread.

For more on the differences between an air barrier and vapor barrier installation and how to best achieve high-performance building envelope systems with Sto products, download our comprehensive guide on engineered building enclosures or contact us today!

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In addition, for the past 30+ years, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE 90.1) and the International Energy Conservation Code (2021 IECC) have required CI, as defined by the ASHRAE 90.1-2010.

The ASHRAE 90.1-2010 defines CI as insulation covering all structural members without thermal bridges other than service openings and fasteners. Builders must install CI on the interior or exterior of any opaque building envelope surface.

Fortunately, there are energy-efficient, code-compliant exterior insulation and finish systems (EIFS), like StoTherm® ci Wall Systems Drainable EIFS, that provide a superior solution for achieving CI.

EIFS can be either field applied or panelized in a complete factory-assembled wall system (cladding system, framing, and sheathing) that contains CI and an air barrier to comply with modern energy code goals. It is an ideal solution for both new construction and renovation, providing a cost and energy efficient solution to achieving performance goals while not compromising on the facade aesthetics.

The Evolution of Continuous Insulation in Exterior Wall Systems

For many years, builders placed batt insulation between the studs in the wall’s cavities to insulate exterior wall systems. Unfortunately, this insulating method failed to consider the thermal transmission of cold and heat through the studs, which significantly diminishes the R-value of the insulation.

To alleviate this, builders began applying cladding with continuous insulation (CI) to the exterior wall system (the beginnings of EIFS), which more effectively maintained a consistent interior temperature and lessened energy use.

Barrier EIFS

The first type of EIFS, face-sealed (barrier), consisted of an insulation board fastened to the structural wall surface, typically gypsum. However, when water got into the system, face-sealed EIFS did not allow it to drain. Also, many parts of the barrier EIFS absorbed and held moisture. A lack of drainage and the use of moisture-sensitive components made buildings constructed with barrier EIFS prone to mold problems and insect damage, and led to the development of Drainable EIFS systems backed up with air and water-resistive barrier components that protect the building from moisture intrusion.

Drainable EIFS

About 30 years ago, the EIFS Industry Members Association (EIMA) and International Conference of Building Officials (ICBO) addressed the problems of barrier EIFS by implementing stricter requirements to prevent moisture issues in EIFS, leading to the development of drainable EIFS.

Drainable EIFS includes a secondary moisture barrier and vertical drainage channels with weep holes in the bottom to drain collected water, significantly reducing moisture issues.

Scientific Study Validates Using Drainage EIFS

From 2005 and 2007, the Oak Ridge National Laboratory (ORNL) studied the energy efficiency, moisture intrusion, and temperature control between EIFS, stucco, brick, cementitious fiberboard, and stucco siding. It concluded that drainage EIFS with CI provides superior moisture and temperature control performance when compared to brick, cementitious fiberboard siding, and stucco.

Drainage EIFS expanded in 2009 when the International Building Code (IBC) recognized EIFS as an acceptable building product and directed applying a water-resistive barrier to EIFSs. Today, improvements in moisture resistance and retention of EIFS make it a superior choice for a cladding system.

Achieving Continuous Insulation with EIFS

The exterior CI of EIFS wraps a building with insulation (R-value between 4 and 5.6 per inch), unlike conventional cavity batt insulation installed between the studs. Providing CI with EIFS lessens thermal bridging and improves air and moisture infiltration management to create higher-performing buildings with reduced energy consumption. In addition, durable EIFS complies with NFPA 285 (referenced in 2021 IBC Section 1403.5) to limit fire spread both horizontally, and vertically. Depending on the insulation type used, R-Values of up to R43 can be achieved with code compliant EIFS systems.

Components of EIFS

EIFS contains multiple layers over exterior sheathing, providing superior insulation and moisture protection. The standard components (layers) of EIFS include:

1. A water-resistive barrier over the substrate stops moisture from infiltrating the wall assembly.
2. A layer of mineral wool, expanded polystyrene (EPS), or extruded polystyrene (XPS) gives added insulation.
3. A layer of fiberglass mesh adds reinforcement and crack resistance. It protects against crumbling and cracks due to freeze/thaw cycles, shifting foundations, and thermal expansion.
4. A water-resistant base coat implanted into the glass-fiber reinforcing mesh and applied on top of the insulation acts as a weather barrier.
5. A finishing coat furnishes the texture, color, and protective nature of the exterior surfaces of the buildings or homes.

Structural and Aesthetic Benefits of EIFS

EIFS’s structural and aesthetic appeal makes it an ideal product for retrofitting and new construction. In addition, builders can apply these multilayered systems to concrete, wood, or steel substrates in any climate. Specific design and structural advantages include:

• Aesthetically versatile EIFS can mimic marble, brick, granite, and stone.
• Energy-efficient drainage EIFS with CI meets the requirements of ASHRAE 90.1.
• Fire-resistant EIFS passes the required building codes for ignitability  (NFPA 268), fire resistance (ASTM E119), and intermediate multi-story fire test (NFPA 285).
• EIFS resists flames spreading within the combustible component/core of panels from one story to the next. EIFS also limits the lateral spreading of flames from the origin of the compartment fire to adjacent spaces.
• Low-maintenance EIFS resists structurally damaging and unhealthy mold.

Achieving CI with StoTherm® ci Wall Systems Drainable EIFS

Unlike some EIFS systems, StoTherm® ci Wall Systems Drainable EIFS offers a more modern approach to EIFS technology with drainage that helps to prevent moisture intrusion into the wall cavity. The straightforward application of long-lasting StoTherm® ci Wall Systems Drainable EIFS provides excellent energy efficiency, condensation, impact, and fire resistance, and design flexibility.

Durability

Durable StoTherm CI EIFS will last the life of the building with proper maintenance. In addition, you can repair EIFS with the help of an EIFS professional. For information on repairing EIFS, you can refer to the StoTherm® EIFS Reference Guide or contact one of our experienced representatives at 1-800-221-2397.

Energy-Efficiency

All EIFS provide CI, which reduces energy use, saves money, and complies with today’s energy codes.

Condensation Resistance

EIFS insulation thickness should prevent the interior air from reaching the dew point (the temperature when water vapor turns to water) to minimize condensation within the wall assembly.

Impact Resistance

Designing EIFSs with a high-impact mesh tremendously improves impact resistance.

Fire Resistance

Fire-resistant EIFS pass the required building code tests for ignitability (NFPA 268), fire resistance (ASTM E119), and intermediate multi-story fire test (NFPA 285). Click here or contact one of our experienced representatives at 1-800-221-2397 for more on NFPA 285 testing of Sto wall systems.

Quality Sealants

Stopping water intrusion into the wall system must include properly installing quality sealants.

Design Flexibility

EIFS allows you to customize the cladding system’s aesthetic to fit your project’s needs.
StoTherm® ci Systems advanced integrated wall assemblies combine protective and aesthetic components into a superior wall cladding. The system’s high-performance features include:

StoGuard® fluid-applied air and water-resistive barriers are a fully-adhered seamless monolithic exterior wall air and moisture barrier that protects against moisture infiltration and unwanted air movement – perfect for all types of construction.

StoTherm® ci cladding systems combine CI, air and water-resistive barrier, drainage, and many textured finishes and coatings in order to produce a sustainable, high-performance wall cladding. The durable and attractive system creates maximum curb appeal and saves money through reduced energy bills.

Sto’s architectural coatings provide all the features of high-quality EIFS paints; superior protection against fading, mold, mildew, and crack bridging, self-cleaning properties, vapor permeability, and low VOC. In addition, the coatings come in an assortment of sheens and textures, or we can tint them in a vast array of colors to fit all your exterior design requirements.

Sto’s high performance finishes provide architects with the complete design freedom of an expansive selection of finishes in many color and texture options. We manufacture durable Sto finishes to the highest quality standards, to resist dirt and water and protect your home or building while providing attractive curb appeal.

Drainable EIFS – StoTherm® ci Wall Systems

Sto offers eight drainable EIFS StoTherm® ci Systems, including four StoTherm® ci Hurricane Impact Systems – all systems achieve continuous insulation.

StoTherm® ci XPS

Durable and high-performing StoTherm® ci XPS incorporates high R-value extruded polystyrene insulation into the wall assembly and StoGuard® fluid-applied moisture and air barrier, to create water and air-resistant walls for thermal efficiency.

StoTherm® ci

Lightweight StoTherm® ci integrates StoTherm® and the StoGuard® waterproof air barrier, to enhance energy efficiency and protect against moisture infiltration.

StoTherm® ci Mineral

The StoTherm® ci Mineral system includes a non-combustible, mineral wool exterior insulation and continuous air and moisture barrier with Sto’s high-performance finish to produce an advanced cladding system.

StoTherm® ci MVES

StoTherm ci® MVES (masonry veneer engineered system) is a StoTherm® ci system with masonry veneer, natural stone, ceramic tile, or manufactured stone used as the facade finish. It also meets relevant building code requirements.

StoTherm® ci HI-PLY

The high-performing StoTherm® ci HI-PLY exterior wall cladding system combines CI with seamless moisture and air barrier and advanced drainage capabilities over CDX exterior plywood sheathing. StoTherm® ci HI-Ply’s engineering archives the testing requirements for large and small missile impacts.

StoTherm® ci HI-CM 180

High-performing, energy-efficient, and hurricane-resistant StoTherm® ci HI-CM 180 is a CI wall cladding that integrates StoTherm® insulated cladding, StoGuard® waterproof air barrier, and drainage capabilities over CMU substrates. In addition, StoTherm® ci HI-CM 180’s engineering meets the testing requirements for large and small missile impacts.

StoTherm® ci 1177-SM

StoTherm® ci 1177-SM exterior wall cladding systems combine seamless moisture and air barrier with advanced drainage capabilities over glass mat gypsum sheathing. The engineering of StoTherm® ci 1177-SM meets the testing requirements for small missile impacts.

StoTherm® ci 1177-LM

StoTherm® ci 1177-LM exterior wall cladding systems provide a seamless moisture and air barrier with CI, advanced drainage capabilities, and Sto Armor Mat XX Mesh for additional impact and reinforcement resistance over glass mat gypsum sheathing. The engineering of StoTherm® ci 1177-LM fulfills the testing requirements for large and small missile impact performance on 16-gauge steel studs with gypsum sheathing.

The Benefits of StoTherm ci EIFS Systems

StoTherm® ci cladding systems combine CI, air/moisture barrier, drainage, and many textured finishes to create a sustainable, high-performance wall cladding. The durable system maintains its maximum curb appeal and saves money through lower energy bills.

Sto offers a variety of Continuing Education classes to provide designers with additional information about designing with Sto’s envelope system. Click here to see our upcoming schedule of online training sessions.

Click here or contact one of our experienced representatives at 1-800-221-2397 to learn more about achieving continuous insulation with EIFS.

The post Achieving Continuous Insulation with EIFS appeared first on Sto Corp..

The design of the cladding system must ensure durability, sustainability, and energy efficiency. The building cladding influences the look and feel of the surrounding area, so it should give visitors a memorable first impression of the building.

What is a Cladding System?

The building cladding refers to all the building components that are attached to its primary structure (parts that keep it standing), that form the external, non-structural surfaces. Often, cladding attaches to the building’s structural frame as prefabricated panels, whether it’s cladding systems for high-rise buildings or residential homes.

A high-performing cladding for buildings provides more than just a building’s exterior facade and aesthetics. Quality building cladding systems:

• Protect the structures from external elements (rain, snow, wind, ice)
• Minimize the spread of fire
• Provide thermal insulation to create air tight building envelope to manage the inside environment
• Transfer impact and wind loads to the structural framework
• Provide privacy and security and prevent the transmission of sound
• Provide openings for ventilation, daylight, and access

Properly-installed, high-quality, well-designed cladding materials for buildings minimize air leakage, maximize thermal performance, and optimize natural daylight. These features lessen the need for electrical and mechanical systems and contribute toward a sustainable, energy-efficient, safe, and durable building.

The Four D’s of High-Quality Cladding Systems

High-quality cladding systems must provide consistent deflection, drainage, drying, and durability:

1. Drainage refers to cladding materials’ capacity to allow water that gets behind the outer surface to drain. Applying a water-resistant barrier over the sheathing and a drainage gap between the sheathing and the cladding can provide adequate drainage. However, stucco cladding, which can’t handle large volumes of water, often needs enhanced drainage, requiring a drainage mat to increase the space between the cement membrane and WRB. The space permits more accessible water flow down and out from within the cladding.
2. Deflection refers to the cladding’s ability to consistently deflect ice, snow, and rain that attacks the outside wall surface. In addition, you can assist the water deflection with gutters and overhangs.
3. Drying refers to a cladding system’s permeability or ability to permit ventilation within the system to encourage drying. Building codes often require vapor-permeable exterior cladding to permit moisture or condensation to travel through it as a vapor when heated by the sun. Including open space at the top and base of the wall cladding will allow airflow and additional drying.
4. Durability refers to the cladding system’s ability to resist continuous exposure to ultraviolet (UV) rays, thermal contraction and expansion, and wetting-and-drying cycles. Durable cladding systems will help stop leaks and protect the building envelope’s integrity.

Other essential features to consider when choosing a high-performance cladding system include:

• Ease of installation
• Continuous insulation, adequate airtightness, and control of thermal movement
• Low-maintenance
• Fire resistance

Sto High-Performance Cladding Systems

Sto offers various simple and quick-to-install, high-quality cladding systems that meet the requirements for water drainage and deflection, permeability, airtightness, fire resistance, low maintenance, and long-lasting durability, to preserve a building’s integrity for its lifetime. We cover every feature of our wall systems under a single-system warranty.

Our systems combine all of the wall components into one tested, code-compliant system: continuous thermal insulation, air and water-resistive barrier, and endless aesthetic facade surface choices to meet all the needs of your design. In addition, you can combine several facade aesthetics into one system without transitions and product compatibility design difficulties.

Our tested systems at Sto also ensure that all components work together as mandated by today’s building codes:

• Sto high-performance wall systems provide air leakage below 0.04 cfm/ft2 at 1.57 psf (0.2 L/s•m2 at 75Pa) when tested according to ASTM E2357 – a feature that potentially saves 40 percent in cooling and heating costs.
• Sto’s wall cladding’s high R-value ( e.g. StoTherm® has an R-Value of 3.6 per inch) limits thermal bridging and lessens energy use. 
• Sto products achieve a Class A rating when tested in accordance with ASTM 84 for Flame Spread and Smoke Development.
• Sto walls have achieved several sustainable credentials:
  • Manufactured in ISO 9001 (Quality) and ISO 14001 (Environmental)  certified factories
  • SCAQMD (South Coast Air Quality Management District) VOC requirements
  • C-ES durability and fire protection criteria
• Sto wall systems that contain combustible insulation or other combustible elements meet the requirements of:
  • NFPA 268 fire testing, which offers a method to assess the chance for a fire in one building to ignite a nearby building.
  • NFPA 285 fire testing, which evaluates the fire performance of wall assemblies with combustible insulation or other combustible components in noncombustible construction.
  • ASTM E 119 fire testing, which establishes the hourly fire-resistance rating of the wall assembly.

30 Sto High-Performance Cladding Systems

Drainable EIFS (Exterior Insulation Finishing System) – StoTherm® ci Wall Systems

StoTherm® ci cladding systems combine continuous insulation (ci), drainage, air and water-resistive barrier, and many aesthetic finish options to create a sustainable, high-performance wall cladding. The beautiful and durable system maintains long-lasting curb appeal and saves money through reduced energy bills.

1. StoTherm® ci MVES

StoTherm® ci MVES (masonry veneer engineered systems) with masonry veneer in ceramic tile, natural stone, or manufactured stone conforms to relevant building code requirements.

2. StoTherm® ci Mineral

The StoTherm® ci Mineral system incorporates non-combustible, mineral wool insulation and continuous water-restrictive and air barrier with Sto’s high-performance finishes to create an advanced high-quality wall cladding system.

3. StoTherm® ci XPS

High-performance and durable StoTherm® ci XPS incorporates elevated R-value extruded polystyrene insulation into the wall assembly and StoGuard® fluid-applied air and water-resistive barrier, to produce a water and airtight wall, and ensure thermal efficiency and superior durability.

4. StoTherm® ci

StoTherm® ci combines StoTherm® and the StoGuard® air and water-resistive barrier system for increased energy efficiency and protection against moisture infiltration.

5. StoTherm® ci HI-LM CMU 180

Energy-efficient, high-performing, and hurricane-resistant StoTherm® ci HI-LM CMU 180 is a continuous insulation wall cladding that combines StoGuard® waterproof air barrier, StoTherm® insulated cladding, and drainage. In addition, the StoTherm® ci HI-LM CMU 180’s engineering meets the strict Miami-Dade County, Florida NOA criteria for small and large missile impact resistance, water and air infiltration, and wind load resistance.

6. StoTherm® ci 1177-LM

The high-performance StoTherm® ci 1177-LM exterior wall cladding system combines seamless air and water-resistive barrier with continuous insulation, advanced drainage potential, and Sto® Armor Mat XX Mesh for added reinforcement and impact resistance over glass mat gypsum sheathing. The engineering of StoTherm® ci 1177-LM meets the strict Miami-Dade County, Florida NOA testing criteria for small and large missile impact resistance and performance on 16-gauge steel studs with gypsum sheathing.

7. StoTherm® ci 1177-SM

The StoTherm® ci 1177-SM exterior wall cladding system combines seamless water and air barrier with continuous insulation and advanced drainage potential over glass mat gypsum sheathing. In addition, the engineering of StoTherm® ci 1177-SM meets the stringent Miami-Dade County, Florida NOA standard for small missile impact resistance, water and air infiltration, and wind load resistance.

8. StoTherm® ci HI-PLY

The StoTherm® ci HI-PLY exterior wall cladding system combines seamless water-restrictive and air barrier with continuous insulation and advanced drainage potential over CDX exterior plywood sheathing. In addition, the engineering of StoTherm® ci HI-Ply meets the strict Miami-Dade County, Florida NOA testing standard for small and large missile impact resistance, water and air infiltration, and wind load resistance.

StoVentec® Rainscreen Systems

Rainscreen claddings protect against damaging moisture (especially crucial with water-absorbing claddings) by providing a ventilation gap between the siding and water and air barrier. A small gap (as tiny as ½-inch) permits adequate drainage and drying.

StoVentec® Systems are a complete, fully-tested, and code-approved high-quality ventilated Rainscreen® system that includes water-restrictive and air barrier, non-combustible mineral wool insulation, an installer-friendly, adjustable sub-framing system, and our outstanding StoVentec® Rainscreen® cladding.

In the U.S., StoVentec® ventilated rainscreen cladding systems come in several finishes to provide designers with a range of aesthetic options to create unique building facades with high-performance engineered characteristics.

9. StoVentec® for Masonry Veneer Facades

StoVentec® masonry veneer facades provide a drained and back-ventilated rainscreen wall system with aesthetic options of thin brick, tile, and masonry.

10.StoVentec® Glass

StoVentec® Glass is an open joint, drained, and back-ventilated rainscreen wall system with an opaque glass facade in aesthetic options of back-colored glass, custom printed glass, and frosted glass.

11. StoVentec® Render

StoVentec® Render is a drained and back-ventilated rainscreen wall assembly that offers performative aesthetics including Sto textured finishes, Stolit Lotusan self-cleaning textured finish, Sto specialty finishes and Sto Cast, Sto’s prefabricated resin cast shapes.

StoPanel Technology Systems Prefabricated Exterior Wall Panels

Sto’s prefabrication solution, Sto Panel Technology®, is finished exterior wall panels. The StoPanel® system panels contain cold-formed metal framing and other applicable components, including glass mat sheathing, continuous insulation, water-restrictive and air barrier, sub-framing, and a facade aesthetic. Thermally insulating the exterior of the wall structure with continuous insulation makes them compliant with the latest standards and codes (ASHRAE 90.1-2019 and IBC, IRC, and IECC – 2018 and 2021).

Prefabrication provides several significant benefits:

• Helps to stay on budget
• Lessens change orders
• ݈Lowers delivery time and labor needs
• Improves quality control and assurance
• Boosts job site safety
• Reduces construction wastes

12. StoPanel® Classic NExT ci

StoPanel® Classic NExT ci prefabricated wall panels include gypsum sheathing, steel framing, and StoTherm® ci facade.

13. StoPanel® Mineral ci

StoPanel® Mineral ci prefabricated wall panels include gypsum sheathing, steel framing, non-combustible continuous insulation, continuous air and water-resistive barrier and a wide variety of Sto textured and specialty finishes.

14. StoPanel MVES

StoPanel® MVES prefabricated wall panels include gypsum sheathing, steel framing, and Adhered Masonry Veneer (AMV) – thin brick, ceramic tile, natural stone, or cultured stone.

15. StoPanel® Impact ci

StoPanel® Impact ci prefabricated wall panel includes gypsum sheathing, steel framing, and a StoTherm ci system, designed to meet the Miami-Dade small and large missile impact requirements.

16. StoPanel® Dri-Design®

StoPanel® Dri-Design® prefabricated wall panel includes gypsum sheathing, steel framing, and Dri-Design® metal facade.

17. StoPanel® Swisspearl®

StoPanel® Swisspearl® prefabricated wall panel includes gypsum sheathing, steel framing, and Swisspearl fiber cement facade.

18. StoPanel® 3DP Powered by Branch Technology

Sto Panel Technology® and Branch Technology creates a superior 3-dimensional design for exterior walls. The prefabricated, panelized wall combines the building envelope layers into a customizable 3D printed lightweight, easy-to-install, robust, and composite shape. In addition, the branch’s unique Cellular Fabrication (C-Fab®) 3D printing process can create a highly unique and functional architectural facade panel in virtually any form or shape.

19. StoPanel® XPS

StoPanel® XPS prefabricated wall panels include gypsum sheathing, steel framing, and StoTherm® ci facade that includes Extruded Polystyrene Foam Insulation.

20. StoPanel® Brick

StoPanel® Brick prefabricated wall panels include gypsum sheathing and steel framing, with thin masonry or brick veneers.

21. StoPanel® Precast

StoPanel® Precast prefabricated wall panels include gypsum sheathing, steel framing, and various integral decorative and protective finish choices to replicate precast concrete.

22. StoPanel® Metal

StoPanel® Metal prefabricated wall panels include gypsum sheathing, steel framing, and metal facade.

23. StoPanel® Backup

StoPanel® Backup prefabricated wall panels contain steel framing, gypsum sheathing, and an air/water-restrictive barrier. Builders apply the facade on-site.

StoQuik® Silver Systems Cement Board Stucco

StoQuik® Silver Systems combine the moisture protection of StoGuard air and water-resistive barrier with the draining and drying of a drainage mat, the strength of a cement board substrate, and the versatile performance and selections of Sto’s textured finishes – without complicated installation, moisture exposures, and labor steps of traditional stucco.

24. StoQuik® Silver DrainScreen

Durable StoQuik® Silver DrainScreen cement board stucco system provides excellent energy efficiency and improved water drainage.

25. StoQuik Silver® DrainScreen MVES

High-impact and weather-resistant StoQuik® Silver DrainScreen cement board stucco system provides superior moisture protection for exterior vertical above-grade walls in low-rise commercial, institutional, and residential construction. It combines the StoGuard® air and water-restrictive barrier with the strength of cement board substrate while achieving the aesthetic of masonry veneers such as thin bricks, natural stone, ceramic tiles, and manufactured and culture stones

In addition, StoQuik® Silver DrainScreen features Sto DrainScreen technology to promote superior drainage and drying of the wall system. It also incorporates StoColl masonry veneer adhesive, a high-performance polymer modified portland cement thin-set adhesive to produce an advanced engineered wall cladding system.

StoPowerwall® Stucco Systems

26. StoPowerwall® Stucco Systems

StoPowerwall® Stucco Systems provide fully-tested stucco systems with superior moisture management and comprehensive design options, to ensure low-maintenance and durable claddings with all the protection and energy efficiency of StoGuard®.

StoPowerwall® Stucco Systems combine protective and aesthetic elements into a superior wall cladding, including StoGuard® fluid-applied moisture and air barrier, StoPowerwall® Stucco, and Sto textured finishes and coatings that keep out moisture while furnishing many design options. In addition, Sto systems include the Sto DrainScreen drainage mat for added moisture protection and optional Crack Defense, an added fortification layer for preventing cracking.

27. StoPowerwall® DrainScreen MVES

The StoPowerwall® DrainScreen MVES stucco wall assembly with masonry, thin brick, tile, or cultured stone veneer, includes the moisture protection of StoGuard® water-restrictive and air barrier and Sto DrainScreen to lessen the risk of water accumulation.

28. StoPowerwall® ci

StoPowerwall® ci energy-efficient stucco wall assemblies include continuous insulation of outbound extruded polystyrene (EPS).

29. StoPowerwall® ExtraSeal®

The StoPowerwall® ExtraSeal® stucco wall system applies directly to concrete masonry units with Sto ExtraSeal moisture and air protection.

30. StoPowerwall® DrainScreen

The StoPowerwall® DrainScreen stucco wall systems integrate the durability and strength of traditional stucco with StoGuard moisture protection, Sto DrainScreen, and Sto high-performance finishes. However, it does not include insulation.

Why Select Sto’s High-Performance Cladding Systems?

Sto’s 30 cladding systems offer all the crucial components a high-performance cladding system needs to provide moisture protection through deflecting, draining, and evaporating moisture on the inside and outside of the wall assembly. They also create energy-efficient, long-lasting, and durable cladding systems.

Furthermore, quick and easy-to-install, Sto systems integrate all the wall components into one unit:

• Air and water-resistive barrier
• Continuous insulation
• Reinforcement system
• Endless aesthetic facade surface options to accommodate all the needs of your designs without the design challenges of transitions between systems

Download our comprehensive guide on engineered building enclosures today for more on high-performance cladding systems.

The post 30 High Performance Cladding Systems appeared first on Sto Corp..

Exterior Insulation Finishing Systems (EIFSs) provide an insulated, finished surface that creates exterior walls with superior moisture and temperature control performance over other cladding products like brick, stucco, and cement fiberboard siding.

Simple-to-install, EIFS siding applies in multiple layers over an exterior sheathing to produce an energy-efficient, low-maintenance, fire-resistance, beautiful, and versatile exterior cladding. The typical layers (components) of EIFS include:

• An air and water-resistive barrier over the substrate that stops air leaks and moisture from infiltrating the system.
• Expanded polystyrene (EPS), extruded polystyrene (XPS), or mineral wool layers that add insulation and enhance energy efficiency.
• A layer of fiberglass mesh that adds crack-resistance and provides reinforcement. It also protects against crumbling and cracks due to thermal expansion, shifting foundations, and freeze/thaw cycles.
• A water-resistant base coat, embedded into the glass-fiber reinforcing mesh, applies insulation’s top, to provide a weather barrier.
• A finishing coat or cladding surface that creates the color, texture, and protective nature of the structures’ exterior surfaces.

Unlike some EIFS systems, StoTherm® ci Wall Systems Drainable EIFS provides a more modern approach to EIFS technology with drainage that helps to prevent moisture from entering the wall cavity.

All long-lasting EIFS types should provide straightforward application and offer impact and condensation resistance, excellent energy efficiency, and design flexibility.

Impact Resistance

Designing EIFSs with a high-impact mesh substantially improves their impact resistance.

Condensation Resistance

EIFS insulation thickness should stop the interior air from reaching the dew point (the temperature that water vapor turns to water), in order to minimize condensation within the wall system.

Quality Sealants

Preventing water intrusion to the wall system must include proper installation of quality sealants.

Energy-Efficiency

All EIFS provide continuous insulation (CI) which lessens energy use, saves money, and meets today’s energy codes.

Design Flexibility

EIFS allows you to customize the aesthetic of the cladding system to fit the needs of your project.

A Modern Approach to the EIFS Technology Drainable StoTherm® ci Wall Systems EIFS

The International Building Code and ASTM International define traditional EIFS as a non-load bearing, exterior wall cladding system with an insulation board attached either adhesively or mechanically to the substrate, a reinforced base coat, and a textured protective finish coat.

StoTherm® ci Wall Systems Drainable EIFS improves on traditional EIFS technology by adding drainage to their wall systems. Our systems also include continuous insulation (ci), air and water-resistive barrier, and many performative aesthetics to create a sustainable, high-quality wall cladding. The durable and unique system sustains its curb appeal and saves money through lower energy bills.

Sto offers several StoTherm ci Systems, including four StoTherm ci Hurricane Impact Systems.

StoTherm® ci XPS

Long-lasting and high-performing StoTherm® ci XPS incorporates high R-value extruded polystyrene insulation into the wall system and StoGuard® air and water-resistive barrier, ensuring durability and thermal efficiency.

StoTherm ci MVES

Builders can use StoTherm ci MVES (masonry veneer engineered system) system with masonry veneer, ceramic tile, natural stone, or manufactured stone as a facade finish to acheive masonry aesthetics while meeting applicable building code requirements.

StoTherm® ci

Lightweight StoTherm® ci combines the StoTherm® and the StoGuard® air and water-resistive barrier systems to improve energy efficiency and protect against moisture intrusion.

StoTherm® ci Mineral

The StoTherm® ci Mineral System incorporates non-combustible, mineral wool exterior insulation and continuous air and water-resistive barrier with Sto’s high-performance finishes to produce an advanced high-performance cladding system.

StoTherm® ci HI-CM 180

High-performing, hurricane-resistant, and energy-efficient, StoTherm® ci HI-LM CMU 180 provides a CI wall cladding by combining several components to enhance its performance over concrete masonry substrates: StoGuard® air and waterproof barrier, StoTherm® insulated cladding, and drainage capabilities. Additionally, StoTherm® ci HI-CM 180’s engineering satisfies the testing requirements for small and large missile impacts.

StoTherm® ci 1177 -SM

High-performing StoTherm® ci 1177-SM exterior wall cladding systems combine a seamless air and water-resistive barrier with advanced drainage capabilities compared to glass mat gypsum sheathing. In addition, the engineering of StoTherm® ci 1177-SM complies with the testing requirements for small missile impacts.

StoTherm® ci 1177 -LM

High-performing StoTherm® ci 1177-LM exterior wall cladding system combines seamless air and water-resistive barrier with CI, advanced drainage capabilities, and Sto Armor Mat XX Mesh for added impact resistance and reinforcement compared to glass mat gypsum sheathing. The engineering of StoTherm® ci 1177-LM achieves the testing requirements for large and small missile impact performance on 16-gauge steel studs with gypsum sheathing.

StoTherm® ci HI-PLY

High-performing StoTherm® ci HI-PLY exterior wall cladding systems integrate seamless air and water-resistive barrier with CI and advanced drainage capabilities for use with CDX exterior plywood sheathing. The engineering of StoTherm® ci HI-Ply also meets the testing requirements for large and small missile impacts.

Why Choose StoTherm ci EIFS Systems?

StoTherm ci Systems advanced integrated wall assemblies combine aesthetic and protective components into high-performing wall cladding, that features:

StoTherm® ci Cladding Systems

StoTherm® ci combines drainage, CI, air and water-resistive barrier, and endless choices of textured finishes and surfaces to produce a sustainable, high-quality wall cladding. The durable system maintains its attractive curb appeal and saves money through reduced energy bills. Sto offers eight StoTherm ci Systems, including four StoTherm ci Hurricane Impact Systems.

StoGuard® Fluid-applied air and water-resistive barrier

StoGuard®’s fully-adhered seamless monolithic exterior wall air and water-resistive barrier system protects against unwanted air movement and moisture infiltration – ideal for all types of construction. You can apply StoGuard® with airless spray or a roller, which speeds up the application and simplifies integration with other wall system components.

Sto Textured Finishes

Sto Performative Aesthetics provide architects with complete design freedom with an expansive selection of finishes in endless textures and color options. We manufacture durable Sto finishes to the highest quality standards to resist dirt and water in order to protect your home or building while providing long-lasting curb appeal.

Sto Offers the Best EIFS Siding Options

StoTherm ci Systems checks all the boxes for a high-quality EIFS siding option – excellent moisture management, durability, low maintenance, the energy efficiency of the StoGuard® air and water-resistive barrier system, and comprehensive design options.

Learn more about EIFS siding options within our selection of inspirational case studies and don’t hesitate to contact one of our knowledgeable representatives today. 

The post The Best EIFS Siding and Cladding Options appeared first on Sto Corp..

Over the years, significant improvements have solidified it as an excellent choice for a durable, energy-efficiency cladding system:

• In the mid-1990s, the EIFS Industry Members Association (EIMA) and the International Conference of Building Officials (ICBO) mandated moisture resistance and retention improvements in EIFS.

In 2009 the International Building Code (IBC) recognized EIFS as an acceptable cladding product, requiring the application of a water-resistive barrier.

National Study Validates the Use of Drainage EIFS

Between 2005 and 2007, the Oak Ridge National Laboratory (ORNL) conducted a study comparing the energy efficiency, moisture intrusion, and temperature control between EIFS, brick, stucco, and cementitious fiberboard siding. It concluded that drainage EIFS is a far superior moisture and temperature control performance than brick, stucco, and cementitious fiberboard siding.

EIFS vs. Traditional Stucco

EIFS, commonly referred to as synthetic stucco,  and traditional stucco both provide fire resistance and a good sound barrier. However, while similar in looks, several characteristics change how the two stucco systems function. EIFS weighs 80 percent less than traditional stucco. In addition, EIFS offers more energy efficiency with an R-value between 4 and 5.6, compared to stucco, with an R-value of 0.2.

Traditional Stucco

The composition of traditional stucco includes a mixture of Portland cement, limestone powder, sand, and water. Builders install a base mesh to apply stucco to the building, then spread the stucco over it with a trowel, using a three-coat system. The stucco dries to a rock-hard finish for an affordable, long-lasting, attractive siding. 

EIFS

EIFS is applied in multiple layers over exterior sheathing, providing more insulation and moisture protection than traditional stucco. The typical components (layers) of EIFS include:

• A water-resistive barrier over the substrate prevents moisture from infiltrating the system. 
• A layer of expanded polystyrene (EPS) , extruded polystyrene (XPS), or mineral wool provides added insulation. 
• A layer of fiberglass mesh provides reinforcement and adds crack resistance. It will also protect against cracks and crumbling due to shifting foundations, thermal expansion, and freeze/thaw cycles. 
• A water-resistant base coat, embedded into the glass-fiber reinforcing mesh, applies on top of the insulation, and serves as a weather barrier.
• A finishing coat furnishes the color, texture, and protective nature of the structures’ exterior surfaces.

StoTherm® ci Wall Systems Drainable EIFS  

StoTherm® ci cladding systems combine continuous insulation (ci), air/moisture barrier, drainage, and many textured finishes to create a sustainable, high-performance wall cladding. The unique and durable system sustains maximum curb appeal and saves money through reduced energy bills. Sto offers several StoTherm ci Systems, including four StoTherm ci Hurricane Impact Systems.

• StoTherm® ci 

Lightweight StoTherm combines StoTherm® and the StoGuard® waterproof air barrier system, improving energy efficiency and protecting against moisture intrusion.

• StoTherm® ci XPS

High-performing and durable StoTherm® ci XPS incorporates high R-value extruded polystyrene insulation into the wall assembly and StoGuard® fluid-applied air and moisture barrier, producing water and airtight walls ensuring thermal efficiency and durability. 

• StoTherm ci MVES

StoTherm ci MVES (masonry veneer engineered system) a StoTherm ci system with masonry veneer, ceramic tile, natural stone, or manufactured stone used as the facade finish.  Meets applicable building code requirements.

• StoTherm® Mineral ci

The StoTherm® ci Mineral System incorporates non-combustible, mineral wool exterior insulation and continuous moisture and air barrier with Sto’s high-performance finishes to create an advanced high-performance cladding assembly. 

• StoTherm® ci HI-CM 180

Energy-efficient, high-performing, and hurricane-resistant StoTherm® ci HI-LM CMU 180 offer a CI wall cladding that combines StoGuard® waterproof air barrier and StoTherm® insulated cladding and drainage capabilities over concrete masonry unit substrates. In addition, StoTherm® ci HI-CM 180’s engineering satisfies the testing requirements for large and small missile impacts. 

• StoTherm® ci 1177 -SM

High-performing StoTherm® ci 1177-SM exterior wall cladding assemblies combine a seamless air and moisture barrier with advanced drainage capabilities over glass mat gypsum sheathing. The engineering of StoTherm® ci 1177-SM fulfills the testing requirements for Small Missile impacts. 

• StoTherm® ci 1177 -LM

High-performing StoTherm® ci 1177-LM exterior wall cladding assembly provides a seamless air and moisture barrier with CI, advanced drainage capabilities, and Sto Armor Mat XX Mesh for added reinforcement and impact resistance over glass mat gypsum sheathing. The engineering of StoTherm® ci 1177-LM achieves the testing requirements for small and large missile impact performance on 16-gauge steel studs with gypsum sheathing.

• StoTherm® ci HI-PLY

High-performing StoTherm® ci HI-PLY exterior wall cladding assembly integrates a seamless air and moisture barrier with CI and advanced drainage capabilities over CDX exterior plywood sheathing. The engineering of StoTherm® ci HI-Ply meets the testing requirements for small and large missile impacts.

Structural and Aesthetic Benefits of EIFS

EIFS’s structural benefits and aesthetic appeal make it an ideal product for new and retrofitted construction. Builders can apply these ‘synthetic stucco’ multilayered systems to wood, steel  or concrete substrates in any climate. Specific structural and design benefits include: 

1. Energy-efficient drainage EIFS meets the requirements of ASHRAE 90.1.
2. Fire-resistant EIFS pass the significant tests required by building codes for fire resistance (ASTM E119), ignitability (NFPA 268), intermediate multi-story fire test (NFPA 285), and full-scale multi-story, corner test (ANSI FM 4880). 
3. EIFS resists the spread of flames within the combustible core/component of panels from one story to the next. In addition, EIFS limits the lateral spreading of flames from the origin of the compartment fire to nearby spaces. 
4. Low-maintenance EIFS resists unhealthy and structurally damaging mold.
5. Aesthetically versatile, it can mimic brick, granite, stone, marble.

EIFS FAQs

Is EIFS the Same as Traditional Stucco?

No. While EIFS (synthetic stucco) and traditional stucco look similar, several significant differences change how the stucco systems function:

• Traditional stucco is installed directly to the substrate with a base lath attachment. EIFS stucco is applied in multiple layers over exterior sheathing, making it more expensive and less suitable for DIY than traditional stucco.
• EIFS weighs 80 percent less than traditional stucco. 
• EIFS offers more energy efficiency with an R-value between 4 and 5.6 than traditional stucco, with 0.2.
• EIFS’s layer of fiberglass mesh provides added resistance to cracking. It also helps protect against hurricane-strength winds, cracks, and crumbling due to shifting foundations, thermal expansion, and freeze/thaw cycles.

How Long Does EIFS Last?

If properly maintained, EIFS will last the life of the building. For example, StoTherm ci EIFS synthetic stucco systems applied in 1979 to U.S. buildings remain intact today. Proper maintenance includes:

• Periodic cleaning
• Repair of impact damage or punctures to restore surface integrity
• Inspection and maintenance of cladding abutting elements such as sealant and flashing

Can EIFS Be Repaired?

Yes. However, EIFS repairs often require a professional with EIFS experience to avoid further damage and potential water infiltration. You can refer to the StoTherm® EIFS Reference Guide for information on repairing EIFS or contact one of our experienced representatives at 1-800-221-2397. 

What Is the Best Paint for Recoating EIFS?

The best paint for EIFS should enhance your building’s character while providing superior protection against fading, mold, mildew, and crack bridging. The paint should also offer self-cleaning properties, vapor permeability, and low VOC. 

Fortunately, Sto’s architectural coatings provide all the features of a high-quality EIFS paint. We offer everything from acrylic-based permeable coatings to superhydrophobic coatings. Superhydrophobic coatings have self-cleaning properties and a biomimetic principle for fast drying after rain or dew. In addition, the coatings come in an assortment of textures and sheen, or we can tint them in an endless array of colors to fit all the needs of your exterior design. Click here to learn more about our high-performing coatings.

How Is EIFS Installed?

EIFS stucco is applied in multiple layers over the exterior sheathing. The typical components (layers) of an EIFS include:

• A water-resistive barrier covers the substrate to protect moisture from infiltrating the system. 
• A drainage plane located between the water-resistive barrier and the insulation board provides a drainage space (air gap) and weep openings. The drainage space allows moisture to drain between the drainage plane and the exterior cladding. The weep openings direct the draining moisture to the exterior outside the wall system.
• A polystyrene foam board or mineral wool provides added insulation.
• A layer of fiberglass mesh provides reinforcement and adds resistance to cracking. It will also protect against hurricane-strength winds, cracks, and crumbling due to shifting foundations, thermal expansion, and freeze/thaw cycles. 
• A water-resistant base coat, embedded into the  glass-fiber reinforcing mesh, applied on top of the insulation serves as a weather barrier.
• A finishing coat furnishes the color, texture, and protective nature of the structures’ exterior surfaces.

An experienced professional typically installs EIFSs due to their complexity. Click here for Sto’s StoTherm® ci Install Guide or contact one of our experienced representatives at 1-800-221-2397.

Is EIFS Fire-Resistant?

All EIFS manufacturers in the Industry Members Association (EIMA) have passed ignitability, fire resistance, intermediate multi-story, and flame spread tests, meeting the standards of each test. EIFS and drainage EIFS generally utilize foam plastic as the insulation, making them combustible assemblies. Therefore, according to Chapter 26 of the 2021 IBC, they must test for all building heights. Furthermore, the IBC also mandates the testing of exterior walls to prove compliance with the acceptance criteria of NFPA 285 (Section 2603.5.5). However, Sto also offers StoTherm ci Mineral EIFS with non-combustible Mineral Wool insulation.

Click here for more on NFPA 285 testing of Sto wall systems, or contact one of our experienced representatives at 1-800-221-2397.

What Is an Exterior Insulation and Finish System?

EIFSs apply in multiple layers over exterior sheathing, to create energy-efficient, fire-resistant, low-maintenance, beautiful, and versatile exterior cladding. Over the years, significant improvements have solidified EIFSs as a superior choice for a durable, energy-efficiency cladding system.

Click here to learn more about Sto’s StoTherm® ci systems, drainable EIFS, or contact one of our experienced representatives at 1-800-221-2397.

Is EIFS in Commercial Building Codes?

Yes. The 2021 IBC (Section 1407) outlines the requirements for EIFS construction. For more information on StoTherm® ci code compliance, click here. 

Do Insurance Companies Cover EIFS Projects?

Yes. Fortunately, the EIFS Industry Members Association (EIMA) website offers updates, education, and resources to help EIFS applicators obtain affordable EIFS insurance with a list of knowledgeable EIFS insurance brokers.

What EIFS Finishes Do You Offer?

Sto Textured Finishes provide architects, buildings, and homeowners complete design freedom with an extensive selection of finishes in many textures and color options, enhancing your design and harmonizing with the surrounding environment. We manufacture durable Sto finishes to the highest quality standards, to resist water and dirt to protect your building or home while providing outstanding curb appeal.

Click here for more information on Sto’s aesthetics.

What to Look For in a High-Quality EIFS System

The design of a long-lasting EIFS system should allow straightforward application, and limit long-term problems due to improper installation. A high-performing EIFS system should also provide impact and condensation resistance, all features offered by StoTherm ci EIFSSystems.

• Impact Resistance: Designing EIFSs with a high-impact mesh will substantially improve their impact resistance.
• Condensation Resistance: EIFS insulation thickness should stop the interior air from reaching the dew point (the temperature that water vapor turns to water), minimizing condensation within the wall system.
• Quality Sealants: Preventing water intrusion to the wall system must include proper installation of quality sealants. 

Why Choose StoTherm ci EIFS Systems? 

StoTherm ci Systems check all the boxes for a high-quality synthetic stucco cladding product – excellent moisture management, low maintenance, durability, the energy efficiency of StoGuard® air and moisture barrier system, and comprehensive design options.

StoTherm ci Systems advanced integrated wall systems combine protective and aesthetic components into superior wall cladding. The system’s high-performance features include:

• StoGuard® fluid-applied air and moisture barrier: Ideal for all types of construction, StoGuard® ‘s fully-adhered seamless monolithic exterior wall air and moisture barrier protects against moisture infiltration and unwanted air movement. You can apply StoGuard® with a roller or airless spray, which speeds up the application and simplifies integration with other wall assembly components. 
• StoTherm® ci cladding systems:  StoTherm® ci combines CI, air/moisture barrier, drainage, and numerous textured finishes to produce a sustainable, high-performance wall cladding. The durable and eye-catching system maintains maximum curb appeal and saves money through lower energy bills. Sto offers eight StoTherm ci Systems, including four StoTherm ci Hurricane Impact Systems.
• Sto Textured Finishes: Sto Textured Finishes provides architects, builders, and homeowners with complete design freedom with an extensive selection of finishes in many textures and color options, to enhance your design and harmonize with the surrounding environment. We manufacture durable Sto finishes to the highest quality standards to resist water and dirt, and protect your building or home while providing outstanding curb appeal.

Don’t hesitate to reach out to one of our experienced representatives today to learn more about EIFS, or synthetic stucco.

The post Exterior Insulation Finishing Systems (EIFS), Commonly Known as Synthetic Stucco Ultimate Guide appeared first on Sto Corp..

Drainage Problems with Traditional Stucco Walls

Traditional stucco walls require a drainage mat to drain and dry water that infiltrates the wall system. Improperly installed or cracked stucco will allow moisture to penetrate a wall system, which can lead to extensive mold and rot in the supporting layers behind the stucco surface.

What is a Stucco Drainage Mat?

A stucco drainage mat creates a continuous, predictable air gap between the wall’s bottom layer or plaster coating (scratch coat) and the weather-resistant barrier. This improves a stucco wall’s ability to drain and dry. Any veneer that is directly attached to a wall (stucco, wood or cement sidings, faux rock) requires a drainage plain.

Benefits of a Stucco Drainage Mat

Drainage mats provide a pathway for the water to drain behind the veneer, which provides several significant benefits to the wall system:

• The air gap improves the WRB’s performance by eliminating condensation, which can lead to corrosion and structurally damaging and unhealthy mold. 
• The mat helps the wall system dry quickly.
• The mat provides a buffer for expansion and contraction helping to limit cracking in the stucco.
• Drainage mats may extend the lifespan and aesthetic integrity of stucco.
• As the sun beats down on stucco, the drainage mats create a thermal break to stop the transfer of the sun’s heat to the wall system.

How to Choose a Stucco Drainage Mat

Criteria for choosing a manufactured drainage mat include drainage efficiency, compressive strength, and ease of installation. Most come in the form of roll stock, for simple installation. However, when deciding on the right one for your project, consider a manufacturer that offers tested, engineered wall systems for your stucco project like the StoPowerwall® Stucco Systems.

Our representative can show you why StoPowerwall® DrainScreen Stucco Systems are the ideal stucco system with a drainage mat solution that provides durability, protection, energy efficiency, in a vast selection of moisture-resistant coatings and finishes. 

StoPowerwall® Stucco Systems integrate advanced components, including StoGuard® and Sto’s high performance aesthetics, to provide maximum long-term protection and sustainability, outperforming traditional stucco.

The StoPowerwall® Stucco System

StoPowerwall® Stucco Systems, for residential or commercial and new or existing structures are durable and energy-efficient, and are available in a vast selection of moisture-resistant coatings and finishes. StoPowerwall® Stucco Systems integrate advanced components, including StoGuard® and Sto performative aesthetics in a wide variety of colors and textures, to provide maximum long-term protection and sustainability and outperform traditional stucco.

StoGuard® Fluid-Applied Air and Moisture Barrier System

Modern, and more complex building codes demand increased protection against moisture damage and unwanted air movement. Builders today need systems that quickly and easily install while providing excellent performance over the building’s lifetime.

StoGuard®’s fluid-applied air and moisture barrier system offers the ideal system for all types of construction. Fast and straightforward to apply, StoGuard® forms a fully-adhered seamless monolithic moisture and air barrier on the exterior wall to protect against moisture and air infiltration.

Sto High-Performance Stucco Finishes

Sto High-Performance stucco finishes allow for design flexibility with a wide selection of textures and colors to enhance your design and fit the surrounding environment. In addition, durable, dirt- and water-resistant Sto finishes will protect your building and provide long-lasting curb appeal.

StoPowerwall® Stucco System Features

StoPowerwall® Stucco systems integrate additional moisture protection via Sto DrainScreen drainage mat,  and options including Crack Defense for increased protection of cracking, and continuous rigid XPS insulation for energy efficiency.

StoPowerwall® DrainScreen

StoPowerwall® DrainScreen promotes excellent drainage and drying of the wall assembly for superior air and moisture control. StoPowerwall® DrainScreen provides both an air and moisture barrier as well as a drainage mat that creates an air gap, to allow water that penetrates to drain.

StoQuik Silver® – DrainScreen

StoQuik® Silver DrainScreen takes advantage of the strength and ease of installation with a cement board substrate and  includes the StoGuard air and moisture barrier, Sto DrainScreen drainage mat technology, StoGuard reinforced base coat, and Sto textured finish, resulting in superior energy efficiency, water drainage, and impact resistance.

StoQuik® Silver Systems combine the protection of Sto with the cement board’s high impact resistance. In addition, simple to install StoQuik® Silver DrainScreen reduces downtime and allows for earlier occupancy.

StoPowerwall® for Concrete Masonry

The StoPowerwall® for Concrete Masonry stucco system applies directly to concrete masonry unit wall construction. Featuring StoGuard® ExtraSeal, the StoPowerwall® stucco system provides excellent air and moisture protection.

This complete stucco system includes StoGuard air and moisture barrier, a drainage mat, and a high-performance textured finish.

StoPowerwall® Crack Defense

The StoPowerwall stucco wall assembly is offered with an optional Crack Defense layer to help prevent cracking. Sto Crack Defense consists of Sto mesh embedded in Sto polymer reinforced basecoat. This fortification layer is ideal to prevent surface cracking in the finish of new construction, and to repair and refinish existing stucco buildings.

StoPowerwall® ci

StoPowerwall ci is an energy-efficient stucco wall system with continuous air and moisture barrier and continuous insulation. In addition, it provides the impact- and puncture-resistance of traditional stucco with an advanced cavity wall design to remove moisture. As a result, StoPowerwall ci reduces maintenance, lessens heating and cooling costs, and protects against damaging and unhealthy mold.

Why Choose StoPowerwall® Stucco Systems?

StoPowerwall® Stucco Systems provide superior and aesthetically attractive finished results, and consistently outperform traditional stucco when adequately integrated into wall construction with code-compliant building paper, wood, lath, metal frame, or CMU backup. 

Simple and fast to install StoPowerwall® Stucco Systems combine multiple components into one system, to lessen time and labor while protecting against weather and cracking, eliminate moisture within the wall system, and save energy. In addition, our products offer design flexibility with an extensive range of colors and textures.

Contact Sto Corp professionals today for more on stucco drainage mats and how StoPowerwall® Stucco Systems can help you save money and time while providing more protection, durability, and sustainability than traditional stucco.

The post Considerations for the Best Stucco Drainage Mat Solution appeared first on Sto Corp..

Tight Building Envelope Design

A high-performing building envelope design includes all the elements of a building’s outer shell (walls, roofing, foundations, windows, and doors), effectively controlling 

heat, air, and moisture and preventing rain intrusion. The envelope should also manage noise, solar radiation, airborne pollutants, and the spreading of fire and smoke. Furthermore, the building envelope system should ensure durability, structural strength, pleasing aesthetics, short- and long-term economic feasibility, and code compliance.

The 2021 commercial IECC section C402.5 dictates compliance of the thermal envelope of buildings in Sections C402.5.1 through C402.5.8., and the 2021 residential International Energy Conservation Code (IECC), Section R402.4 dictates that the building of thermal building envelopes will limit air leakage by the requirements of Sections R402.4.1 through R402.4.5.

Benefits of a High-Performing Building Envelope

High-performing building envelopes stop air leaks or drafts and moisture infiltration through an exterior wall by installing continuous air and moisture barrier to control the infiltration and accumulation of water. The benefits of high performing building envelopes include:

• Stops air infiltration through the wall, lessening energy use and costs
• Prevents moisture infiltration by stopping condensation in the wall system to resist structurally damaging mold and mildew 
• Manages air and moisture infiltration in a building’s wall system to reduce the risk of decay and corrosion and significantly reduce costly maintenance and repairs
• Contributes to superior indoor environmental quality (IEQ) by creating comfortable and mold-free buildings with controlled acoustics

7 Must-Haves for High-Performance Building Envelope Systems

Builders and architects aiming to construct high-performing building envelope systems should apply the whole-building system approach to create durable, energy- and cost-efficient, and healthy structures. The whole-building system approach encour­ages the entire construction project team to work together to achieve overall project goals for a tight building envelope.

The seven must-haves for designing a high-performing building envelope system should include thermal, air, vapor, water-shedding control layers, durability, and adequate roofing and glazing systems.

1. Thermal Control Layer

A tight building envelope requires continuous insulation (CI) over all building components without thermal bridges other than fasteners and service openings. CI controls thermal heat transfer, lessens condensation (eliminating unhealthy and structurally damaging mold), and minimizes temperature fluctuations. CI will reduce or eliminate thermal bridging in order to protect the insulation’s R-value.

Sto Rainscreen® Systems Provide Continuous Insulation

StoVentec® Rainscreen® Systems offers a complete solution in a fully-tested, code-approved high-performance back-ventilated Rainscreen® system. The easy-to-install glass rainscreen system provides thermally efficient and continuous insulation, to limit damaging condensation and reduce the cost of heating and air-conditioning.

At the same time, its structural frame enhances safety against fire and wind loads. StoVentec® Rainscreen® Systems provide an established facade that you can finish with traditional plaster,  masonry, or even glass cladding. Our extensive design flexibility offers many textures, shapes, colors, and material type choices to fit your aesthetic and architectural requirements.

2. Air Control Layer

A high-performance building envelope must prevent the transfer of air (and the moisture contained in) between the exterior and interior to regulate the indoor climate. An air barrier must also stand up to the air pressure differences acting on them by minimizing heat gains and losses through convection, conduction, and radiation. Air barriers stop air from  transporting moisture to the interior of a wall assembly, preventing condensation and the damaging effects of moisture accumulation.

Essential components of a high-quality air barrier include: 

• The stiffness and strength to resist forces acting on them during and after construction
• Structural integrity (durability) over the lifetime of the building
• Continuous over the entire building’s envelope
• Impermeable to airflow

StoGuard® Family of Air and Moisture Barriers

Like all Sto wall systems, the StoGuard® family of air and moisture barrier products offers the first line of protection against air leakage and moisture intrusion, which is critical to a high-performing building envelope. The StoGuard® System provides seamless control over moisture and air to improve building performance and occupant comfort. Our air and moisture barrier products include:

• Fluid-applied air and moisture barriers provide a seamless barrier to improve a building’s energy efficiency and resist moisture intrusion and condensation 
• Rough opening protection with a one-component fabric or mesh-based product solution designed for a superior, seamless rough opening protection
• A versatile transition membrane for detailing areas to provide flexible connections and continuity of the air barrier system
• Sheathing joint treatments featuring a one-component fabric or mesh-based product solution designed for seamless joint treatment and sheathing protection

3. Vapor Permeable Water-Restrictive Barrier

A vapor permeable water-resistive barrier (WRB) beneath the siding protects walls from snow, rain, and vapor. The WRB must also allow moisture that makes its way into the wall system from a structure’s interior to diffuse through the assembly and dry. In addition, WRBs often function as a building’s air barrier. 

Managing the flow of water through a building envelope and removing the moisture that inevitably makes its way into it, involves following three basic principles:

1. Deflect the water with properly installed cladding and a water-resistive barrier.
2. Drain the water away from the building envelope by installing drainage mats forming drainage cavities.
3. Provide a WRB with enough permeability so the system can quickly dry.

The optimum perm rating for a WRB stops water from entering the wall cavity and allows moisture vapor that does infiltrate to escape. Of concern, too high a perm will permit moisture from the outside to penetrate the wall system. In contrast, too low a perm will trap the moisture within the wall system. According to Joseph Lstiburek, founding principal of the Building Science Corporation, the ideal WRB perm for balancing the inward and outward moisture movement within the building envelope ranges between 10 and 20 perms. However, a designer should select the specific permeability of a WRB  based on climate and positioning within the wall assembly.

4. Water-Shedding Control Layer

Controlling rainwater penetration into a building envelope must consider the forces (gravity, wind pressure differences, and capillary action) that drive the water, and the building envelope system components needed to regulate and combat these forces. 

Features that control water include:

• Flashing systems
• A well-defined drainage path
• Horizontal and vertical plane changes
• A continuous watertight membrane

Building a cavity wall (drainage or screen wall) provides a concealed open air space and drainage plane.

Drainable EIFS StoTherm® ci Wall Systems Control Water Accumulation

Drainable EIFS StoTherm® ci Wall Systems combines drainage, continuous insulation (CI), and an air and moisture barrier to create a long-lasting, durable, and energy-efficient wall system, which will save money on utilities, repairs, and maintenance. In addition, sustainable StoTherm® ci wall systems also improve indoor comfort and air quality and are available in a wide variety of textured finish options to meet your aesthetic and architectural needs.

5. Durability

A building envelope’s durability and long-term performance depend on its resistance to mold, corrosion, freeze damage, and decay. Unfortunately, building envelopes can also fail due to poor workmanship, design flaws, material problems, etc. Therefore, selecting simple to install and durable products, like StoPanel® MVES ci, will help ensure the long-term performance of your building envelope components. 

StoPanel® MVES ci combines high strength masonry veneer (thin brick, natural stone, ceramic tile, or cultured stone), a continuous air/moisture barrier, and an engineered insulating wall system to provide a durable, air and weather-tight wall system with excellent thermal performance.

Cement Board Stucco

Quick and straightforward to install StoQuik® Silver Systems integrate several components into one system in order to create a high-impact, moisture-resistant exterior wall finish that expedites the delivery time and reduces labor costs compared to traditional stucco: 

• An air and moisture barrier to provide moisture protection
• A drainage mat to drain and dry 
• Cement board substrate for impact resistance 
• Versatile performance and design options of Sto’s textured finishes

Architectural Coatings

Sto’s advanced architectural vapor permeability low-VOC coatings offer fade- and mold resistance, crack bridging, and self-cleaning properties. All features ensure superior protection against outdoor elements, to improve the building’s performance and ensure your structure’s long-term aesthetics. Sto’s architectural coatings come in many textures, sheens, and colors that can be applied either horizontally or vertically.

Hurricane Impact Systems

Sto Hurricane Impact (HI) Systems offer high-impact protection for coastal construction prone to hurricanes and tropical storm winds, water intrusion, and wind-born debris – all of which can lead to building envelope failure. Our Sto HI systems meet the stringent Miami-Dade County, Florida NOA requirements for impact resistance, wind load resistance, and air and water infiltration.

6. The Roof of a High-Performing Building Envelope

A tight building envelope needs a cool roof and roofing insulation to protect the building against solar heat gain, and keep the house and attic space cool. Low thermal mass materials, like tiles, slate, or clay, reflect the sunlight, making them suitable for a cool roof. Cool roofs lessen energy bills, and improve indoor comfort. They can also extend the roof’s service life.

7. Adequate Glazing Systems

The design of a high-performing building envelope should include energy-efficient windows, skylights, and doors that are appropriate to the building’s climate zone. High-quality glazings provide natural light, warmth, and ventilation, to save both energy and money.

In addition, glazings should face south in the northern hemisphere to take advantage of the Sun’s energy in the winter months. Finally, limiting south-facing windows and installing shading devices can help prevent excessive heat gain during the hot summers or in warmer climates.

Choose Sto Corp.’s Systems for High-Performance Building Envelope Components

Fast and straightforward to install, Sto Systems offer architects, developers, and contractors with a tested and proven high-performance building envelope. In a single product, our wall systems deliver on all performance needs, saving time and money and reducing labor, complexity, and risk compared to systems that require piecing together numerous components from multiple sources.

Independent testing shows that Sto systems meet or surpass performance specifications for water infiltration and ventilation, impact resistance, wind load resistance, flame spread, accelerated weathering, and water resistance. In addition, StoVentec systems passed the National Fire Protection Association (NFPA) 285 test, a standard measurement for flammability characteristics of modern exterior wall systems.

For more detailed information on high-performance building envelope systems, download our extensive engineered building enclosure guide today.

The post High Performance Building Envelope Systems: 7 Must-Haves for Any Project appeared first on Sto Corp..

Considerations for Building a High-Performance Architectural Facades

A building’s facade architecture design impacts the building’s energy efficiency, durability, and the occupant’s experience. The facade you choose will affect your building costs, long-term maintenance, and utility expenses. 

We offer five considerations when building a high-performance architecture facade:

Energy Efficiency and Sustainable Facades

The facade’s design and how much you implement active and passive strategies will dramatically impact the energy use of your building. Architects can significantly lessen energy costs by utilizing sustainable facade strategies and materials, like those offered by Sto Corp. 

We commit to providing sustainable, safe, and healthy products and services, emphasizing long-term protection for our communities and planet.

Embodied Carbon

Choosing building products that reduce embodied and emitted carbon can reduce your building’s embodied energy by 80 percent. Fortunately, the engineering of Sto’s innovative wall systems reduces carbon emission through durability, energy efficiency, recycling, and the retrofitting of existing building stock as an aesthetic, economical, and energy-saving sustainable alternative to new facade construction.

Durability

A durable facade will maintain its integrity and aesthetics over time, by resisting wind, impact, fading, rain, snow, pollution, ice, hail, etc. A damaged or deteriorated facade can allow water to penetrate, which can lead to severe structural damage.

Acoustic Comfort

Background noise can significantly deteriorate one’s concentration ability and impact a business’s productivity. Facades that contribute to a building’s acoustic comfort by reducing exterior noise will improve the building’s work environment.

Impact on Daylight and Views

The windows of a building’s facade should add to the building’s beauty and also provide daylight and natural ventilation to the occupants. Workers with window views perform 10 to 25 percent better on memory and mental health tests and 6 to 12 percent quicker than employees in windowless rooms.

9 Unique Facade Construction Design Ideas

Interesting building facades represent an architect’s creative vision to give a building life, character, and personality. Sto Corp offers many products and systems to create sustainable, durable, inspiring, and thought-provoking wall envelope solutions with beautiful commercial building facade design.

1. Greenhouse Dispensary – Chicago

StoTherm® ci and computer modeling tools allowed architects to create this “of its time” design for the Greenhouse dispensary. The unique facade showcases fluid lines, giving the illusion of motion with flowing waves rising to meet at a center point, and framing a two-story wall of windows. An application of Stolit® Milano finish adds shine to the completed building.

StoTherm® ci

StoTherm® ci Wall Systems combine continuous insulation, drainage, moisture, and air barrier, to ensure a durable and energy-efficient wall system, to save money on utilities, repairs, and maintenance. In addition, sustainable StoTherm® ci Wall Systems improve air quality and indoor comfort. StoTherm® offers a wide variety of textured finish options to meet your aesthetic and architectural needs. 

Stolit® Milano 

Stolit® Milano is an easy-to-apply, ultra-smooth exterior or interior decorative and protective wall finish. In two to three coats, Stolit® Milano can achieve many decorative looks, from an industrial feel of ultra-smooth metal panels to a fine grit texture. Breathable Stolit® Milano resists structurally damaging and unhealthy mold. It can also provide additional abrasion protection when applied as a topcoat.

2. 207 W. 75th Street, New York City’s Upper West Side

The original elegant porcelain tile facade of this seven-story, seven-unit, residential building was replaced. Large voids had formed due to improper installation, allowing water to seep into the structure. The architect and builder agreed that applying a new facade, using StoTherm® ci with Stolit® Milano, provided the best solution for simulating the ultra-smooth finish of the porcelain tile, and could mimic the grout lines with precisely drawn trowel marks. Installation of the facade:

• First, they applied a layer of Sto Gold Coat®, fluid-applied air and moisture barrier over the original substrate and mortar. Sto designed vapor-permeable, fluid-applied Sto Gold Coat® for application under ci wall systems. 
• Next, a layer of StoTherm ci EPS rigid foam, intended for use in Sto ci Wall Systems, provided a smooth surface to apply the final finish. It also boosts the building’s energy efficiency.
• They applied the topcoat of Stolit Milano with a porcelain finish.
• To match the appearance of the original porcelain tile, they used a trowel to score the joints, in order to replicate the look of grout joints.

3. City Hyde Park, Chicago, Illinois

Architects designed the facade of the lower two-story retail portions of this Chicago residential midrise tower with a sophisticated tile mosaic that wraps around the building, interpreting the four seasons. Sto Panel Technology, Sto’s prefabricated exterior finished wall panels, proved to be an excellent choice to achieve the design vision of the project. The complex job required 20,660 ft² of StoPanel® Backup with mosaic tile, StoPanel® Classic ci, and StoPanel Metal ci. The design also included punched windows to give the tower facade an appearance of ribbon windows.

StoPanel® Classic ci

Lightweight and sustainable StoPanel® Classic ci provides an energy-efficient and durable prefabricated exterior wall panel with continuous exterior insulation, StoGuard waterproof air barrier, and multiple options for metal wall coverings. In addition, StoPanel® Metal ci provides compliance for a continuous air barrier and fire- and wind resistance. LEED eligible StoPanel® Classic ci complies with Energy Standards (ASHRAE 90.1) and Green Building Standards (ASHRAE 189.1).

In addition, versatile Sto finishes permit almost any design aesthetic on lightweight prefabricated StoPanel® Classic ci.

StoPanel® Backup

Energy-efficient and lightweight StoPanel Backup is a prefabricated exterior wall panel with an exterior continuous air and moisture barrier – it is the backbone of StoPanel Technology. StoPanel Backup consists of cold-formed steel, glass-mat-faced gypsum sheathing, and StoGuard air and moisture barrier.

StoGuard Air and Moisture Barrier

Fast and easy to install StoGuard®’s fluid-applied air and moisture barrier system forms a fully-adhered seamless monolithic moisture and air barrier on the exterior wall, to protect against air and moisture infiltration.

4. Cherese Mari Laulhere Children’s Village at Miller Children’s & Women’s Hospital

The architects designed the exterior envelope of this children’s hospital to reflect the theme of light, color, and energy. A few challenges included accommodating California seismic requirements, precise alignment of Dri-Design metal panel joints with EIFS reveals, and extensive wall penetrations. At the recommendation of a commercial wall systems contractor (Nevell Group), they decided on prefabricating the exterior walls with StoPanel Classic NExT ci and StoPanel Dri-Design. The panel’s design meets seismic needs, addresses visual alignments, delivers the textures and intense colors needed in the design theme and allowed for the project to meet the targeted open time. 

Lightweight, prefabricated StoPanel Classic NExT ci offers an energy-efficient and durable with continuous insulation, StoGuard waterproof air barrier, and the patented “Sto Wedge,” to provide drainage. In addition, StoPanel Classic NExT ci allows for a wide variety of Sto’s premium standard and specialty textured finishes.

Easy to install, the StoPanel Dri-Design® system provides a continuous air and moisture barrier, exterior insulation, and a fully customizable, endless design option.

5. Apex Entertainment Facility

The Apex project had two significant challenges: a quick timeline and environmental regulations.

While workers framed the Apex project, Atlanta Prefab manufactured off site 50,000 ft² of StoPanel® Classic ci panels for the Apex Entertainment Facility, allowing them to enclose the building in only six weeks. Furthermore, manufacturing of the panels offsite reduced the risk of airborne construction contaminants, which could potentially affect the adjacent wetlands.

6. Conductive Education Centre

To make young students feel at home when learning at school, RPM Architects designed the Conductive Education Centre with eye-catching, colorful interesting facades that beautifully incorporate a StoVentec® Glass Rainscreen® system. 

​​StoVentec Glass Rainscreen Cladding Systems

StoVentec® Glass Rainscreen® systems create facades that combine performance and durability with the beauty and allure of glass. They offer design flexibility, accommodating endless, and unique facades, with many textures, shapes, colors, and material types. In addition, easy-to-install glass rainscreen breathable systems provide thermally efficient insulation that lowers the cost of heating and air-conditioning, limits damaging condensation, and reduces heating and air-conditioning costs. At the same time, its structural frame enhances safety against fire and wind loads.

7. MP09 Black Panther, Graz, Austria

GSarchitects designed the mixed-use building with energy-efficient StoVentec® Glass: black glass panels that reflect their environment. As they rest on its bases with the spectacular protruding bow, it gives the appearance of a panther ready to pounce – giving it its name, Black Panther.

8. Palma Aquarium, Palma de Mallorca, Spain

Built-in 2007, the bent facade of the Palma Aquarium gives the impression of a living organism. Architects accomplished this with StoVentec® Glass Rainscreen®, which allowed for custom sizes of the sweeping design. In addition, the non-visible StoVentro Agraffe profile permitted the attachment of glass-colored panels to the rear side, to create a visual flow of color and curve.

9. Reston Town Center, Reston, Virginia USA

Duda Paine Architects chose StoVentec® Glass to create a bold, reflective, geometric ceiling to connect the towers of Reston Town Center. StoVentec® allowed contractors to use a single system from one manufacturer to construct a geometric structure on an exterior ceiling. Maintaining the flatness of the prisms required nearly 3000 ft² of StoVentec® Glass Panels attached to a marine-grade plywood substrate. One-hundred thirty-two glass panels of different sizes and finishes make up the three diamond-shaped prisms of the bridge.

The StoVentec components used for the Reston Town Center included the StoVentec Glass panel assembly, StoVentro Sub-construction, and StoTherm ci.

Choose Sto Products to Create Interesting Facade Architecture Design

Sto can help you achieve unique, interesting, and attainable architectural facades with our wide range of aesthetic possibilities and building envelope solutions. Our products also promote sustainability, durability, safety, and enhanced indoor environmental quality. 

Don’t hesitate to contact our facade professionals or explore more examples of unique architectural facades amongst our inspirational case studies!

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