CertainTeed's DiamondDeck® High Performance Synthetic Underlayment is manufactured to provide best-in-class performance in terms of both weather protection and contractor safety.
DiamondDeck is a synthetic, scrim-reinforced, water-resistant underlayment that can be used beneath shingle, shake, metal or slate roofing. It has exceptional dimensional stability compared to standard felt underlayment.
Felt underlayment can wrinkle when it becomes wet and "telegraph" those wrinkles through to the shingles applied over it. DiamondDeck eliminates this problem and its special top surface treatment provides excellent slip resistance, even when wet.
Due to variations in computer monitors and printers, the color sample seen on your computer screen may not exactly match the corresponding color. To verify actual product color, ask to see the actual product, available through your CRE Roof Masters roofing contractor near me.
When DiamondDeck® is used in conjunction with a CertainTeed roofing product, DiamondDeck will take on the same warranty period as the shingle above it. When DiamondDeck is used with a non-CertainTeed product, the limited warranty period will be 30 years.
Sam Musacchia HCI# 20170532