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.


Owens Corning® ProArmor® Synthetic Roof Underlayment with Fusion Back Coating Technology™ is strong, durable and repels water unlike #15 felt. It’s also light, easy to install and contributes to safe working conditions.

  • Dual-surface slip resistance: Fusion Back Coating Technology™ paired with a non-woven surface provides excellent walking conditions during shingle application even on steeply pitched roofs
  • Repels moisture and helps provide protection against water infiltration
  • Resists stretching and tearing around fasteners
  • Available in 42-inch lightweight rolls for easy installation
  • 10-Year Limited Warranty*
  • For use under asphalt shingles only
ProArmor® 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 size10sq.
Length286 ft.
Width42 in.
Weight25 lb.7
Coverage (with 3-in. overlap)929 sq. ft.
Exposed ColorLight gray
Surface ConstructionNonwoven

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

7. Includes core weight.

* See actual warranty for complete details, limitations and requirements. A longer limited warranty term applies when ProArmor™ is used in conjunction with Owens Corning® Roofing Shingles.

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

ASTM 108/UL 790, Class A Fire Resistance - Underlayment is tested as part of a roof assembly that includes wood decking, underlayment and asphalt shingles.

Applicable Standards & Approvals

  • ASTM D226
  • ASTM D4869
  • ICC-ES AC188
  • ASTM E108/UL 790, Class A Fire Resistance
  • 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.