GAFGLAS® Built-Up Roofing provides a redundant system of reinforced base, ply and cap sheets installed with the proven effectiveness of hot asphalt to protect your roof from weathering and leaks. GAFGLAS® base, ply, and cap sheets are fiberglass reinforced providing high tensile strength and excellent dimensional stability. Systems available include high wind uplift resistance, UL Class A fire ratings and Energy Star® rated cap sheets.