Roof Deck Protection - Deck Armor

Deck-Armor™ Premium Breathable Roof Deck Protection

Protect Your Home With Premium Breathable Roof Deck Protection

Roof Deck Protection should help protect your home and reduce trapped moisture at the same time (amazingly, most synthetic underlayments do NOT!)

It provides a critical extra layer of protection between your shingles and your roof deck — to help prevent wind-driven rain (or water from other sources) from infiltrating under your shingles and causing damage to your roof structure or to the inside of your home. In addition, premium-quality roof deck protection will:

  • Help Reduce Trapped Moisture...

    From inside your attic, allowing it to escape (to help prevent structural decay, mold, and mildew)

  • Provide Longer-Lasting Leak Protection...

    Than conventional “felts” (which can rot or become brittle before your shingles reach their useful life)

  • Lie Flatter... Good Housekeeping

    So your shingles will lie flat
    and uniform

Deck-Armor™ Breathable Roof Deck Protection is a key part of the GAF Lifetime Roofing System, and has even earned the prestigious Good Housekeeping Seal. (See Details)  

Conventional organic felts can absorb moisture, causing severe buckling and wrinkling — and a terrible-looking roof

Conventional Organic Felts

The very best roofing systems require premium, breathable roof deck protection.

Deck-Armor™ Premium Breathable Roof Deck Protection combines exceptional strength and excellent breathability to help protect your home against roof rot and other costly damage!

  • Exceptionally Strong…

    At least 600% greater tear strength than standard #30 felt!

  • Revolutionary Breathable Technology…

    Helps prevent inside moisture from becoming trapped within your roofing system — and possibly causing mold, mildew, and expensive structural damage

  • Premium Construction…

    Exceptionally durable, non-asphaltic construction will not rot or become brittle (unlike conventional asphalt felts, which can disintegrate over time)

  • Long-Lasting Protection…

    Up to a Lifetime ltd. warranty when installed on Lifetime Shingle roofs. (See Details)

  • Looks Better…

    Unlike conventional asphalt felts, Deck-Armo Premium Breathable Roof Deck Protection resists wrinkling or buckling, so it lets your shingles lie flatter for a better-
    looking roof

Deck-Armor™ Premium Breathable Roof Deck Protection resists moisture, so it lies flatter for a better-looking roof!


Professional Installers Love Deck-Armor™ Roof Deck Protection

The exceptional walkability of Deck-Armor™ Premium Breathable Roof Deck Protection keeps installers safer on the job!

Deck-Armor™ Premium Breathable Roof Deck Protection combines high tear resistance and nail pull-through with a special slip-resistant surface for exceptional walkability — even on steeper pitches!

Installers’ Best Choice

  • Safer…

    Special slip-resistant surface provides enhanced walkability, even on steeper-pitched roofs

  • Resists Wrinkling...

    Unlike conventional organic felts, Deck-Armor Roof Deck Protection resists wrinkling and buckling — and it will still remain flat

  • Lightweight...

    At 37 lbs. per roll, it’s nearly 1/3 the weight of a roll of #30 felt

  • Installs Faster, Saves Labor...

    Extra-wide 54” roll installs up to 50% faster than traditional 36"-wide felts

  • Cooler To Work With...

    Light-blue surface is cooler in hot weather than conventional black felts

  • Easier To Cut...

    Spun-bound design is easier to cut than some other synthetic underlayments

  • Avoids Downtime...

    Will not become rigid in extreme cold weather or sticky in hot weather

Product Specifications (Nominal)

  • Approx. 10 Squares/roll (excludes laps)
  • Approx. 37 lbs./roll
  • 54" wide, 223' long
  • UV-stabilized polypropylene construction resists UV degradation for up to 180 days*
  • Miami-Dade County Product Control Approved
  • Florida Building Code Approved
  • Listed with Texas Department of Insurance as an acceptable alternate roof underlayment
  • ICC-ES ESR-2808
  • Meets or exceeds the physical requirements of ASTM D226 and D4869
  • Meets UL Class A fire rating when used with UL Class A rated roof coverings

* 180-day UV resistance refers to standardized testing conducted to ensure the product will not physically degrade when exposed to UV. It is NOT related to withstanding water, snow, or wind. While Deck-Armor™ Premium Breathable Roof Deck Protection is water resistant, it is NOT WATERPROOF. DO NOT USE Deck-Armor™ Premium Breathable Roof Deck Protection as a temporary roof to protect property or possessions.

Note: Deck-Armor™ Premium Breathable Roof Deck Protection must only be installed using plastic cap nails or plastic cap staples. Do NOT use staples or nails without caps.

Note: Contact GAF Technical Services at 1-800-ROOF-411 or visit for acceptable non-asphaltic roofing systems and limited warranty coverage.


All documents are U.S. English unless otherwise noted

Get Automatic Lifetime Protection On Your Deck Armor™ Roof Deck Protection and Your Entire GAF Roofing System!

  • A Lifetime ltd. warranty... on your shingles and all qualifying GAF accessories! (See Details)
  • Non-prorated coverage for the first 10 years (See Details)

Professional Installation
GAF Roof Wizard Virtual Home Remodeler

Product Pricing and Where to Buy