Deck Defense®


Helps Create a Water-Proof Barrier

Provides a secondary barrier to help keep water out of the home.

Helps Create a Water-Proof Barrier

Provides a secondary barrier to help keep water out of the home.


Your roof is a big investment. Help protect it right from the start against water damage in the attic, which can cause mold growth and rotting deck boards. Deck Defense® High Performance Synthetic Roof Underlayment features a durable construction that works with your shingles to help shield your home from moisture infiltration.

  • Acts as a non-absorbent, secondary water-shedding barrier
  • Unique bottom surface coating reduces the chance for tears that cause leaks, as compared to other felt underlayment
  • Provides roof deck protection from UV exposure for up to 6 months*
  • Extra wide rolls cover approximately 5 times more than standard #30 felt rolls
  • Preprinted nailing pattern and overlap lines help speed installation
  • 30-Year Limited Warranty**
Deck Defense® High Performance Synthetic Roof Underlayment is part of the Owens Corning® Total Protection Roofing System®^.

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Specifications and Literature


Product Information

Product Information

Roll size10 sq.
Length250 ft.
Width48 in.
Weight36 lb.6
Coverage (with 3-in. overlap)937 sq. ft.
Exposed ColorLight grey
Surface ConstructionCoated textured poly

1. Available in fire-rated (FR) versions. Visit for product specification data sheets applicable to these products.

2. All values are approximate.

3. Maximum allowable thickness at 1,000°F (538°C): Type I-HP - 8.5" (216mm); Type II-HP - 6"(152mm).

4. The surface burning characteristics of these products have been determined in accordance with UL 723, ASTM E84 or CAN/ULC-S102. These should be used to measure and describe the properties of materials, products or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use. Values are reported to the nearest 5 rating.

5. Preproduction qualification testing complete and on file. Chemical analysis of each production lot testing required for total conformance.

6. Includes core weight

* Special application required for extended exposure. See installation instructions.

** See actual warranty for complete details, limitations and requirements.

^ Excludes non–Owens Corning™ roofing products such as flashing, fasteners and wood decking.

Underlayment is tested as part of a roof assembly that includes wood decking, underlayment and asphalt roof shingles.

Applies for all areas that recognize Miami-Dade Product Control Section.

Applicable Standards & Approvals

  • ASTM D226
  • ASTM D4869
  • ASTM E108/UL 790, Class A Fire Resistance
  • ICC-ES AC188
  • ICC-ESR 3229
  • Miami-Dade Product Approval
  • Florida Product Approval

Total Protection Roofing System®

Total Protection is more than shingle deep

It takes more than shingles to protect your home. It takes an integrated system of components and layers designed to help perform in three critical areas.

  • Seal Helps create a water-proof barrier
  • Defend Helps protect against nature's elements
  • Breathe For balanced attic ventilation

^ Excludes non-Owens Corning® roofing products such as flashing, fasteners and wood decking


Even though we’re a global company, we’re always ready to answer your questions. Call to speak with an Owens Corning representative so you can start your project right away.