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Spray Foam Industry
Gaco Western WallFoam 183M Passes ICC-ES AC377 Appendix X
The liquid spray foam insulation approved for use in unoccupied attic and crawl spaces without use of ignition barrier or intumescent coating

SEATTLE, WAGaco Western announces that its WallFoam 183M now meets the flammability test criteria for attics and crawl spaces set by the International Code Council Evaluation Services (ICC-ES). With this new approval, contractors are able to leave Gaco’s WallFoam 183M spray foam insulation exposed in unoccupied attics and crawl spaces and still meet all code and safety requirements.

“This new approval will save spray foam insulation contractors time and money,” says Tom Sojak, vice president of sales for Gaco Western’s WallFoam division. “With Gaco’s WallFoam 183M, contractors can create the most energy efficient attics and crawl spaces without any extra steps or materials.” View video and images of 183M Appendix X burn test (at the bottom of this article).

Gaco WallFoam 183M is an HFC-blown (zero ozone-depleting) liquid spray foam insulation containing polyols derived from naturally renewable oils, post-consumer recycled plastics and pre-consumer recycled materials with no CFCs, HCF’s or other gases harmful to the environment. The product is a Class I fire-rated foam and does not require an ignition barrier or intumescent coating when used in unoccupied attics and crawl spaces.

“We strive to offer our customers the most innovative products and solutions. Contractors are focused on the bottom line; this new technology will help them increase profits without sacrificing quality or safety,” said Sojak.

Product benefits: spray foam contractors

  • Sprayability – Transcend™ technology provides consistent, user-friendly foam with predictable yields.
  • Less viscous formulation – reduces wear and tear on equipment with less clogging of guns.
  • Lower odor formula – reduces odor in application and improves work environment.
  • Winter and summer formulations – allows expansion of spray window in colder temperatures.
  • Lower spray temperature – easier on equipment and more comfortable to spray.

Product benefits: builders, architects/specifiers and homeowners

  • Energy-efficient – high R-value and seamless air barrier result in reduced energy costs.
  • Strong – improves overall structural strength of wall and roof systems.
  • Healthy – reduces condensation, moisture and mold; improves indoor air quality.
  • Eco-friendly – made from renewable resources and recycled materials; contains no ozone-depleting chemicals.
  • Quiet – air-sealed barrier creates a quiet and more comfortable home with improved acoustical properties.
  • LEED points – environmental benefits can earn up to 20 LEED credits.

About International Code Council Evaluation Services (ICC-ES)
ICC-ES is the United States' leading source of technical information on building products and building technology for code compliance. A nonprofit, public-benefit corporation, ICC-ES performs technical evaluations of building products, components, methods, and materials. The evaluation process culminates with the issuance of reports on compliance with the major U.S. building codes, which are available at

About Gaco Western
Family owned and operated for more than 50 years, Gaco Western manufactures the most technologically advanced, proprietary elastomeric coatings and polyurethane spray foam for the construction and waterproofing industries. Dedicated to meeting the needs of its customers, the Gaco family of brands offers best-of-class solutions for a variety of commercial, industrial and residential applications including: specialty coatings for roof, pedestrian and traffic decking; and spray polyurethane insulation for commercial, industrial and residential applications. Core products include: GacoWallFoam insulation, GacoDeck, GacoShield and GacoRoof coatings for residential applications; Gaco RoofFoam, GacoFlex LM-60, GacoPedestrianDeck and GacoAutoDeck for commercial applications. Products are available nationwide. For more information visit or call 800.331.0196.

Waterproofing and insulating the world, from NASA to your neighborhood, Gaco Western has you covered with innovative solutions.

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