CertainTeed's workhorse smooth, torch-applied, APP-modified bitumen cap sheet, Flintlastic® STA is valued for its quick melt and decades of consistent quality. This 150-mill membrane is manufactured with a resilient polyester reinforcement, offering exceptional durability. STA offers some application forgiveness compared with its granulated counterpart, GTA, with a precise selvage edge and lap line. Coat Flintlastic® STA with SMARTCOAT reflective roof coatings for Integrity Roof System Limited Warranties. Torch-down roofing technology has only strengthened since first coming on the scene in the 1970’s. CertainTeed modifies roofing asphalt with plasticizing atactic polypropylene (APP) polymers to enhance product toughness, especially in environments with elevated UV exposure. These APP modified bitumen products are staples of the torch roofing community, especially in the West and South. Ask any experienced roofing contractor, and they will tell you that a properly installed,...See More high-quality torch system creates a multi-layered barrier that will protect a building for decades to come. Reach out to your local CertainTeed Territory Manager to request a sample and demonstration of Flintlastic® STA. See Less