Products / GlasKap Plus

Johns Manville's fiberglass-reinforced, SBS-modified bitumen, mineral-surfaced cap sheet used as the final ply in a variety of built-up roofing systems. Its SBS synthetic rubber and asphalt blend lets the membrane lay flat, virtually eliminating wrinkles for faster installation, and provides better elongation and cold flexibility than traditional asphaltic cap sheets. The fiberglass reinforcement mat provides low moisture absorption and dimensional stability, and the top surface is protected with ceramic-coated granules. Manufactured to ASTM D3909.