CertainTeed DiamondDeck underlayment is a synthetic polymer-based material that replaces the use of standard felt underlayments.

CertainTeed

CertainTeed DiamondDeck underlayment is a synthetic polymer-based material that replaces the use of standard felt underlayments. It serves as a water-resistant layer beneath roofing shingles and is lightweight, easy to carry and includes a special top surface treatment for superior traction and slip resistance in both dry and wet conditions. A light gray surface color keeps the roof cool during installation and creates a more comfortable working environment. For more information, visit www.certainteed.com.