SubSeal-40™ is a prefabricated, 40 mil self adhering sheet-type waterproofing membrane. It is composed of a tough multi-layer high-strength polymer film that is coated with a layer of specially formulated rubberized asphalt adhesive. A release liner protects the asphalt and is removed as the membrane is installed. Mastic selvedge on both edges for improved sealing.

SubSeal-40 adheres aggressively to most clean, dry substrates including metal, wood vinyl and masonry. It is self-sealing around fasteners to prevent water penetration. The special waterproofing adhesive has a broad temperature range allowing installation in cold weather.