G.A.P. 55 Smooth Organic roofing sheet is applied over the flat roofing deck or insulation before the application of Build Up Roofing systems. . It is also an excellent residential water proofing product for high water areas of roof such as valleys, roof edges and low slope roofs. It also is an excellent vapor retardant when installed with hot asphalt.

WARNING: This product is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.