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.

Technical Information

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.

  • Top Surface: Tear-resistant film
  • Back Surface: Silicone-coated release film
  • Weight: 54 lbs. per roll
  • Dimensions: 36" x 65' ( 200 sq. ft.)
  • Coverage: TwoSquare
  • Thickness: 45 mils
  • ASTM D1970

For additional technical resources please refer to the CertainTeed Commercial Roof Systems Manual.


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.

For detailed installation instructions please refer to the CertainTeed Commercial Roof Systems Manual.

Warranty Details

WinterGuard is warranted against manufacturing defects and to remain watertight for the same period as the warranty duration carried by the shingles applied above it -- up to a maximum of 50 years.