Air and Moisture Barriers

StoGuard® is an efficient assembly of products engineered to create a waterproof air barrier membrane in wall construction. By protecting the backup assembly first, this fluid applied waterproof air barrier provides superior protection against moisture intrusion and air leakage, delivering significant energy savings in hot and cold climates.

StoGuard® Air and Moisture Barrier Systems

Seamless protection for the entire wall assembly.

Air Barriers are required in building walls, regardless of region or climate. Controlling air leakage through the building envelope is critical to achieving high building energy efficiency. Research has shown that air barriers can play a larger role in energy efficiency than increasing insulation thickness.* But 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.

Key Components of the StoGuard® Systems

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Sheathing Joint Treatment

Rough Opening Protection

Transition Membrane

Air & Moisture Barriers

System Features

Waterproof Air Barrier
Protects the wall from moisture intrusion minimizing risk of water damage and associated repair costs.

Air Barrier
Minimizes airflow through the wall construction reducing risk of condensation caused by air leaks.

Energy Efficient
Lowers energy costs by reducing air leakage and heating/cooling loads.

Fire Tested
Compliant with ASTM E-84, NFPA 285 and ASTM E-119 for use on non-combustible construction.

Easy to install
Spray-on or roll-on application with standard airless pump reducing labor cost and avoiding any investment in special equipment.

Durable
Fully adhered and attached to substrate. Does not tear with exposure to weather during construction or while in service.

Low VOCs
With its water-based formula meets strict SCAQMD and LEED VOC requirements.

Extended Exposure
Protects fully exposed substrate for an extended period of time.

Indoor Air Quality
Helps to protect against growth of mold and mildew.

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Explore the Air & Moisture Barrier Configuration Tool to help guide you to what products are right for your project.

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Permeable/Impermeable Fluid-applied Air & Moisture Barriers

The StoGuard® system includes either vapor permeable or impermeable fluid-applied membranes. Determining whether you need a permeable or impermeable air barrier primarily depends on climate and wall design.

Sto EmeraldCoat®
Fluid-applied, vapor-permeable building membrane used under a variety of mechanically attached claddings, including cement board, wood, vinyl, brick, stone and metal panels.

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Permeability: Vapor Permeable
Substrate Type: Glass-Mat Gypsum Sheathing, Exterior Gypsum Sheathing, Exterior Plywood, OSB, Concrete Masonry Units.
Type of Application: Roller-applied / Spray-applied

Sto Gold Coat®
Fluid-applied, vapor-permeable membrane used under adhesively attached continuous insulation to create a continuous air and moisture barrier for gypsum and wood based sheathings or CMU.

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Permeability: Vapor permeable
Substrate Type: Glass-Mat Gypsum Sheathing, Exterior Gypsum Sheathing, Exterior Plywood, OSB, Concrete Masonry Units.
Type of Application: Roller-applied / Spray-applied

Sto Gold Coat® TA
Trowel-applied, vapor-permeable membrane used under adhesively attached continuous insulation to create a continuous air and moisture barrier for gypsum and wood based sheathings or CMU.

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Permeability: Vapor permeable
Substrate Type: Glass-Mat Gypsum Sheathing, Exterior Gypsum Sheathing, Exterior Plywood, OSB, Concrete Masonry Units.
Type of Application: Trowel-applied

icon_for_documents_16_16Sto Gold Coat® TA – Product Bulletin

Sto AirSeal®
Fluid-applied, vapor-permeable membrane designed for CMU and sheathing, as well as metal panels, cement board, vinyl, wood, brick and stone.

Permeability: Vapor Permeable
Substrate Type: CMU, Concrete, Brick Masonry, Glass-Mat Gypsum Sheathing, Exterior Plywood, OSB.
Type of Application: Roller-applied / Spray-applied

Sto VaporSeal®
Fluid-applied vapor barrier used to provide superior protection against moisture intrusion and air leakage.

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Permeability: Vapor Barrier
Substrate Type: CMU, Concrete, Brick Masonry, Glass-Mat Gypsum Sheathing, Exterior Plywood, OSB.
Type of Application: Roller-applied / Spray-applied

Sto ExtraSeal®ci
A trowel or spray-applied, vapor-permeable membrane that can be used as a water-resistive air barrier and as a continuous insulation (ci) adhesive, compatible with most commonly available rigid insulation boards.

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Permeability: Vapor Permeable
Substrate Type: CMU, Concrete, Brick Masonry,
Type of Application: Trowel-applied / Spray-applied

Sheathing Joint Treatment

The StoGuard® system includes sheathing joint treatments optimized for a variety of conditions and trades. Proper protection of sheathing joints is critical for minimizing the risk of moisture intrusion and unwanted air movement.

StoGuard® RapidFill
One-component waterproof air barrier used to provide sheathing joint treatment and protection.  Moisture cure properties and resistance to cold conditions help to avoid costly delays related to inclement weather.  Liquid-applied technology allows for easy installation at complex geometric conditions.

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Permeability: Vapor permeable
Substrate Type: CMU, Concrete, Brick Masonry, Gypsum Sheathing, Wood, Galvanized metal and Cement based Sheathings.
Type of Application: Apply with a caulking gun.

StoGuard® Fabric
Non-woven cloth reinforcement that is used with Sto GoldCoat®, Sto EmeraldCoat® or StoGuard® VaporSeal® to treat sheathing joints and rough openings. Available in 4- and 6- inch widths.

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Permeability: N/A
Substrate Type: Suitable for application of Sto Gold Coat®, Sto EmeraldCoat® or StoGuard® VaporSeal®.
Type of Application: 4” (101 mm) wide fabric at sheathing joints and 6” (152 mm) wide fabric at rough openings and inside and outside corners.


4- inch wide


6- inch wide

Sto Gold Fill®
Flexible, trowel-applied material that is applied over StoGuard® Mesh to treat sheathing joints and and rough openings.

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Permeability: Vapor Permeable
Substrate Type: Glass-Mat Gypsum Sheathing, Exterior Gypsum Sheathing, Exterior Plywood, OSB.
Type of Application: Trowel-applied / Spray-applied

StoGuard® Mesh
Glass fiber self-adhesive mesh for use with Sto Gold Fill®. Available in 4.25- and 9.5-inch widths.

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Permeability: N/A
Substrate Type: Suitable for application of Sto Gold Fill®.
Type of Application: 4.25″ (108 mm) wide mesh at sheathing joints and 9″ (241 mm) wide mesh at rough openings and inside and outside corners.


4.25- inch wide


9- inch wide

Waterproof Transition Membrane

StoGuard® Transition Membrane
A flexible membrane for detail areas to provide flexible connections and continuity of the air barrier assembly. StoGuard Transition Membrane can be installed more simply than alternative products without the need for primers or termination mastics.  StoGuard Transition Membrane  Also functions as a secondary weather seal at joints in construction.

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Permeability: N/A
Substrate Type: CMU, Concrete, Brick Masonry, Glass-Mat Gypsum Sheathing, Exterior Gypsum Sheathing, Exterior Plywood, OSB.
Type of Application: For continuity at transitions, installed with any of the StoGuard® fluid-applied air barrier products.

Rough Opening Protection

The StoGuard® system includes rough open protection optimized for a variety of conditions and trades. Proper protection of rough openings joints is critical for minimizing the risk of moisture intrusion and unwanted air movement.

StoGuard® RapidSeal
One-component waterproof air barrier for rough opening protection. Rapid drying time usually allows same day installation of windows or top coating with other wall assembly components.  Moisture cure properties and resistance to cold conditions help to avoid costly delays related to inclement weather.  Liquid-applied technology allows for easy installation at complex geometric conditions such as wood buck or back dams.

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Permeability: Vapor permeable
Substrate Type: CMU, Concrete, Brick Masonry, Gypsum Sheathing, Wood, Galvanized metal and Cement based Sheathings.
Type of Application: Apply with a caulking gun.

StoGuard® RediCorner
Preformed fabric piece that speeds installation for corners of rough openings. Used with either Sto Gold Coat®, StoGuard® VaporSeal® or Sto EmeraldCoat®.

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Permeability: N/A
Substrate Type: Suitable for application of Sto Gold Coat®, Sto EmeraldCoat® or StoGuard® VaporSeal®.
Type of Application: Placed on the inside and outside corners of rough openings.

StoGuard® Tape
Self-adhering waterproof air barrier material composed of spunbond polyester fabric laminated to rubberized asphalt adhesive. Available in 6- and 9- inch widths.

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Permeability: N/A
Substrate Type: Smooth surfaces, including primed Concrete, CMU, Glass-Mat Gypsum Sheathing, Exterior Plywood, OSB, Cement Board, Asphalt saturated Felt and most House Wraps.
Type of Application: Apply on rough openings to provide protection.


6- inch wide


9- inch wide

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Support Documents

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Phone 1 (800) 221-2397
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