Products / CertainTeed Flintlastic GMS

Granulated, polyester-reinforced SBS-modified bitumen cap sheet applied in hot asphalt or cold adhesive, for low-slope residential and commercial roofs. It is 3.7 mm (145 mils) thick, weighs 93 lbs per roll and covers one square. CertainTeed lists it as meeting ASTM D6164 Grade G Type I, and its product page links ICC-ES report ESR-1388 and a Miami-Dade underlayment systems approval.