CertainTeed WinterGuard HT (High Tack, High Temperature) is an advanced waterproofing underlayment for shingle, metal, slate and tile roofs. It is specially formulated to resist high roof temperatures under metal roofs.
CertainTeed WinterGuard HT has a tough, tear-resistant film on its top surface that will not scratch roofing metal applied over it. The adhesive bottom surface of WinterGuard HT is protected with a disposable silicone-coated release film, which is split longitudinally down the middle for easier application.
Apply CertainTeed WinterGuard HT by the "peel and flop" method, utilizing the two-piece split-sheet release film feature to adhere longitudinal halves, one at a time. It is best to cut the product into manageable lengths of about 10 feet when applying WinterGuard HT by this method.