Proper Installation is Critical.
CertainTeed DiamondDeck® Synthetic Roofing Underlayment is suitable for use under asphalt roofing shingles, wood shingles and shakes, metal shingles, or slate. Follow finished roofing manufacturer’s instructions and all local building code requirements.
Caution! DiamondDeck may be slippery when wet, or when it is covered with dust, frost, ice, or snow.
Apply DiamondDeck only to a clean, smooth nailable deck. Application method is dependent on roof slope, anticipated exposure time, anticipated wind speeds, and climate. If the roof is in a climate where ice damming may occur, then first apply an ASTM D1970-compliant underlayment such as CertainTeed’s WinterGuard™ Waterproofing Shingle Underlayment to all eaves following the directions on the package.
Click on the link to the right for the installation instructions on DiamondDeck Symthetic Roofing Underlayment.
NOTE: To view a listing of credentialed roofing companies in your area who install CertainTeed products, click on the "Find a Roofing Contractor" link located in the left navigation bar.