Skip to main content

CertainTeed DiamondDeck

High Performance Synthetic Underlayment

Product Information

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.


Colors, sizes, & quantities vary based on CSS location. Please visit our contact form here for your inquiries. Updated 8/22/22.

All content is copyrighted & owned by CertainTeed Saint-Gobain.

family-reading-in-backyard

Compare products

Visit one of our local showrooms to view and compare products with guidance from our staff.

installing-roofing-shingles

Get an estimate

We will recommend three roofing contractors to estimate the cost of updating your roof.