Summit® 180 is a high-performance, high-strength, woven fabric based roof system component appropriate for use in virtually all steep slope roof covering systems. Summit® 180 is fully compatible with asphalt shingles, metal roof coverings, clay tile, slate, concrete tiles, wood shingles and shakes or other code approved, steep slope roof covering. The UL Classification demonstrates conformance to critical fire testing requirements. Summit® 180 synthetic underlayment is manufactured of a proprietary lightweight, woven polypropylene fabric, with UV, water resistant and anti-skid non-woven top surface. Summit® 180 is UL 790 compliant for fire resistance, allows for 180-day UV exposure, measures 10 squares and weighs approximately 30 lbs per roll.