RUBEROID® 20 Smooth is a tough, resilient modified bitumen membrane manufactured to stringent GAF specifications. Its core is a strong, resilient non-woven glass mat that is coated with flexible, SBS polymer-modified asphalt. RUBEROID® 20 Smooth is backed by GAF, a company with over 130 years in the roofing business.
Roofs and Roof Accessories: Modified Bituminous Roofing: GAF