Avoid Chemical and UV Damage with This Thermoplastic Roofing Membrane

April 1, 2024
This membrane incorporates Elvaloy HP, which remains locked in the membrane even with harsh environmental exposure.

The KEE-Stone family of thermoplastic roofing membranes now features KEE-Stone HP, which incorporates the ketone ethylene ester Elvaloy HP for flexibility, strength, and chemical and UV resistance. KEE-Stone HP is a fleece-backed thermoplastic membrane designed to serve as the cap sheet in a multi-ply hybrid system that incorporates Garland-approved modified bitumen base sheets.

KEE-Stone HP exceeds the requirements of ASTM D6754, the standard specification for KEE-based sheet roofing. The HP Elvaloy functions as a polymeric plasticizer and remains locked in the membrane even with harsh environmental exposure, helping it avoid the migration, cracking and crazing that typical liquid plasticized membranes are vulnerable to. A novel blend of fire retardants provides superior fire resistance and helps the roof achieve a 3:12 Class A fire rating for a non-combustible deck or a 2:12 Class A fire rating for a combustible deck in a hybrid assembly. The bright white surface, polymer compound and advanced chemistry resist the sun’s damaging effects and reflect UV rays away from the building for a cooler roof surface.a