Products / CertainTeed Flintlastic Ultra Poly SMS Base Sheet

Polyester-reinforced SBS-modified bitumen base ply that may be mechanically fastened, hot-mopped, cold-adhered or torch-applied. It is 3.7 mm (148 mils) thick, weighs 89 lbs per roll and covers one square. CertainTeed lists it as meeting ASTM D6164 Grade S Type I.