A 28-mil, 100' self-adhesive, non-permeable composite sheet membrane, consisting of a foil/polyscrim film, laminated to a layer of butyl designed for air and moisture applications. It provides a 1-year UV exposure with a service/performance temperature range up to 240°F. Butyl properties allow self-sealing around fasteners, sealing of laps, adhesion to the substrate at ambient application temperatures above 20°F (-7°C). |