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High Performance Synthetic Underlayment

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.

 
Features and Benefits
 
  • Lightweight – Easy to work with and carry
  • Excellent 6-month UV stability – Finish roof when you are ready
  • Excellent tear resistance – Durability, reduced puncture risk
  • Superior wet/dry traction – Work faster and safer
  • Cool gray surface color – More comfortable working environment


DiamondDeck Brochure

  • Lightweight – Easy to work with and carry
  • Excellent 6-month UV stability – Finish roof when you are ready
  • Excellent tear resistance – Durability, reduced puncture risk
  • Superior wet/dry traction – Work faster and safer
  • Cool gray surface color – More comfortable working environment
  • Meets ASTM D226 and D4869
  • Length: 250 ft.
  • Width: 4 ft.
  • 38 lbs. per roll

ICC-ES ESR-3344

Data Sheet - DiamondDeck

Miami-Dade - Underlayment Systems

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.

Underlayment Installation Instructions

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.


DiamondDeck Limited Warranty

 
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