A premium Ice Damming and Leak protection used for steep slope roofing under all metal, tile, slate, shake and shingle roofing, the only modified rubberized asphalt Peel & Stick underlayment with a patented slip resistant "Sure-Foot" nodular walking surface technology that allows for easier steep slope walkability, even in wet or dusty conditions. PSU30 also features a crinkled silicon treated poly split release liner making removal quicker and easier than single sheet competitors. Features a self sealing lap seal system which forms an impervious asphalt to asphalt bond at overlapping seams, delivering superior waterproofing protection, an approved Polyfoam underlayment for use with "Polyset" foam systems, Class A Fire ASTM E108, Meets and exceeds ASTM D1970, high temperature (240 deg F/115 deg C) flow resistance, installation temperature 40 deg F (5 deg C) and above, synthetic construction inert to mold growth, cool light gray surface doesn't expand or contract, up to 6 months UV exposure, Roll size of Gross 216 sq-ft. or 20 sq-m, Net of overlap 2 sq.