Products / CertainTeed Vycor Ice & Water Shield HT

Vycor Ice & Water Shield HT is a high-temperature self-adhered roofing underlayment of rubberized asphalt adhesive under a polymeric film with UV barrier properties, rated to 260 degrees F, with a RIPCORD split-release feature and an embossed slip-resistant surface, for use under metal, standing seam, slate, tile, cedar shakes and asphalt shingles. The October 2025 data sheet gives a 36 in. roll in 75 ft. and 66.6 ft. lengths, a 40 mil membrane, and exposure of up to 120 days before the final roof covering; its UL listing R13399 gives UL 790/ASTM E108 Class A under fiberglass shingles and Class C under organic felt shingles.