Membrane Coating

Membrane Coating

Why TOPCOAT® Membrane Coating?

TOPCOAT® Membrane is a water-based, spray-applied liquid that cures to form a seamless, 100% acrylic elastomeric membrane specially designed to seal the entire roof.


  • ENERGY STAR® certified (U.S. only) reflectivity can dramatically decrease building temperatures
  • Highly reflective and listed by the Cool Roof Rating Council for solar reflectance and thermal emittance
  • Rated by the Cool Roof Rating Council (CRRC) for use in Title 24 Projects
  • Offers high tensile strength and elongation, and is virtually undamaged by extended exposure to solar ultraviolet energy
  • Low VOC, non-flammable, and presents minimal hazard to the applicator or the environment
  • Cures and becomes stronger under the sun’s ultraviolet rays
  • Water-based for excellent protection and easy application
  • Limited material warranty available for up to five years1
  • Guarantees available for up to 20 years1


  • TOPCOAT® Membrane is designed to protect and waterproof metal, wood, copper, PVC, transite, and concrete roof substrates for many years.
  • Roof must have positive drainage.
  • Surface must be free of ponding water, ice, snow, and debris prior to application.
  • Do not apply at temperatures below 42°F. Substrate temperatures must be below 120°F when applying product. (for application questions, please contact GAF at 1-800-ROOF-411).

1See applicable warranty or guarantee for complete coverage and restrictions. 


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