Products / Owens Corning WeatherLock Flex Self-Sealing Ice & Water Barrier

WeatherLock Flex is a granule-free self-sealing ice and water barrier with a cross-laminated poly surface over modified asphalt adhesive, meant to conform around irregular shapes, inside corners and sharp angles in applications down to 40 degrees F, under asphalt shingles, wood shakes and quarry slate. The December 2025 data sheet gives a 75 ft. x 3 ft. roll (225 sq. ft.), 40 mils thick, with up to 30 days of UV exposure, and a UL Class A rating when used under asphalt shingles.