Palisade SA-HT is the most advanced self-adhered underlayment on the marketplace today. Featuring category leading Stronghold skid resistant technology, Kool Blue low glare cool surface (8x cooler than felt), 6 months UV exposure, 250 Degrees Fahrenheit HT & 20 Degrees Fahrenheit LT adhesive formulation, tile foam bondable and split poly release film. It is 40 mil, 2 sq/roll, and ASTM D1970 approved. Combine with PALISADE synthetic roofing underlayment for a one stop, ALL-roofing systems (shingle, metal, slate, tile, synthetic) solution.