Products / Derbilume FR

Derbilume FR is a 4.0 mm (157 mil) fiberglass-reinforced modified bitumen cap sheet with an embossed aluminum foil top surface and a polyolefin burn-off film underside, designed for heat-welded use in approved multi-ply membrane and flashing assemblies. The product page, which lists it among Performance Roof Systems' APP modified bitumen cap sheets, calls it a Class A fire resistant membrane; the product data sheet describes it as an SBS-modified bitumen cap sheet. The data sheet lists an initial solar reflectance of 0.87 and Solar Reflectance Index of 93, with CRRC Rapid Ratings 3-year values of 0.72 and 64, and a roll weight of 94 lb for 96.6 square feet of net coverage.