Products / Atlas WeatherMaster HP-Flex Ice & Water Underlayment

WeatherMaster HP-Flex is Atlas's film-faced, high-temperature self-adhering underlayment with a polyester-reinforced top facer over a fiberglass mat, for use under any roofing material at eaves, valleys, problem areas or full-deck coverage. The product page lists a 45 mil thickness, a self-adhering selvage edge, high-temperature stability to 240 degrees F, 90-day UV exposure and installation at 45 degrees F or warmer; the data sheet gives a 36 in. x 65 ft. roll (195 sq. ft.) and a pass on ASTM D1970.