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

WeatherLock G is a granulated, self-adhering ice and water barrier with a fiberglass mat reinforcement, used at eaves, valleys and penetrations under asphalt shingles, wood shakes and quarry slate, and over the full deck on 2:12 to 4:12 pitches with proper ventilation. The November 2025 data sheet gives a 66.7 ft. x 3 ft. roll covering 200 sq. ft., a split backer sheet, a taped selvage edge and up to 30 days of UV exposure. Its ASTM E108/UL 790 Class A fire resistance applies under asphalt shingles.