Sto Corp. Introduces Sto GPS Board Rigid Insulation and the new StoTherm® ci GPS Wall System

ATLANTA, GA (September 13, 2023) Sto Corp., the market leader in innovative exterior wall systems, has announced the introduction of Sto GPS Board, a graphite-enhanced, 100% closed-cell expanded polystyrene insulation board that can be used in a variety of applications, including the new StoTherm® ci GPS wall system, and improved StoTherm ci MVES and StoPowerwall® ci systems.

Compared with other rigid insulation products, Sto GPS Board provides several advantages.  It is cut in thicknesses that align with ASHRAE 90.1 prescriptive continuous insulation requirements, optimizing economy while minimizing wall thickness.  With an R-value per inch of 4.7 at 75°F, Sto GPS Board is comparable to extruded polystyrene products and much more thermally efficient than expanded polystyrene. Sto GPS Board does not contain fluorocarbon-blowing agents.  As a result, it features low global warming potential (GWP) and zero ozone depletion potential (ODP) and is available in all 50 states.

“Sto GPS Board provides substantial benefits over other rigid insulation products,” explains Richard Martens, Sto Corp.’s Director of Business Development.  “We are eager to get it in the hands of contractors and architects so they can see just how great it really is.”

The new StoTherm ci GPS is an exterior insulation and finish system based on the synergistic combination of Sto GPS Board and Sto TurboStick® polyurethane adhesive.  Sto TurboStick® cures quickly, improving installation time and eliminating the need for mechanical fasteners.  Sto GPS Board provides a thinner wall section for a given R-value, with up to R56 insulation performance.  Its silver-grey color provides less glare than white EPS and a professional job site appearance.

StoTherm ci GPS is available in a wide range of performative aesthetics, including StoCast Wood, StoCast Brick, and StoSignature® textures.  Where the hardness and long-term durability of clay brick, stone, or tile are desired, StoTherm ci MVES provides these aesthetics.  Further, StoTherm ci MVES can seamlessly integrate with StoTherm ci GPS.  Both use a continuous StoGuard® air and water-resistive barrier system, and both provide continuous Sto GPS Board insulation.  The result is a multi-clad building installed by one project team, with warranty support from one manufacturer.

Sto GPS Board is also an option within StoPowerwall® ci insulated stucco systems.  Closed-cell Sto GPS Board is vapor semi-permeable, controlling inward vapor drive while preserving the ability of the wall to dry out if exposed to incidental moisture.  Sto GPS Board for use with StoPowerwall® ci systems is available in 4’x 8’ sheets with R5.0 and R10 thermal resistance.

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About Sto

Sto is an international technology leader in the design and production of innovative building materials tailored to human needs. Our wall systems, coatings and finishes have been the choice of leading architects, engineers and contractors for over 60 years, and we are the world’s largest manufacturer of exterior thermal insulation systems, with 50 subsidiaries, more than 5,500 employees, and 21 factories operating around the globe.

Sto Corp., based in Atlanta, Georgia, offers a broad range of advanced cladding, air and water-resistant barrier and coating systems that deliver energy efficiency and superior aesthetics for building construction, maintenance and restoration. The company has also expanded into complete single-source Rainscreen and Industrialized Construction. Sto Corp’s plants are ISO certified for environmental protection and quality control and are strategically located to serve more than 200 distributor shipping locations throughout US. Sto Corp. is committed to developing next-generation building solutions and the company’s employees are advocates for technical mastery in pursuit of a sustainable built environment.

For more information, visit or call toll free (800) 221-2397. Follow Sto Corp. LinkedIn,  Facebook at,  Twitter and the Sto blog