Fiberglas™ Reinforced Felt Underlayment – the Foundation for a Better Roofing System

Fiberglas™ Reinforced Felt Underlayment adds an extra layer of protection beneath the shingles, helping prevent moisture from reaching the roof deck.

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  • Reinforced with fiberglass to support flat, more uniform shingle application
  • Unlike standard felt, resists curling or pulling away from fasteners when exposed to moisture or wind
  • Increased tear strength to resist tears when walked on or in windy conditions, as compared to standard felt

Fiberglas™ Reinforced Felt Underlayment is part of the Owens Corning® Total Protection Roofing System§.

Roll Size

3' x 141.5'

Coverage (with 2-in. lap)

400 sq. ft.

Nominal Roll Weight

42 lb.

§ Excludes non–Owens Corning™ roofing products such as flashing, fasteners and wood decking.
* Fiberglas™ Reinforced Felt is manufactured to comply with ASTM D6757 and manufactured to meet all the performance requirements of ASTM D226 and ASTM D4869, including resistance to liquid water transmission.

LEED® is a registered trademark of U.S. Green Building Council.
Product Specifications

Roll Size

3' x 141.5'

Coverage (with 2-in. lap)

400 sq. ft.

Nominal Roll Weight

42 lb.

Technical Documents
Data Sheet
Installation Instructions
Roofing System Warranty  
LEED® Certification – Roofing Accessories
Safety Data Sheets (SDS/MSDS)
Applicable Standards
ASTM D6757*
ASTM D226, Type II*
ASTM D4869, Type IV*
§ Excludes non–Owens Corning™ roofing products such as flashing, fasteners and wood decking.
* Fiberglas™ Reinforced Felt is manufactured to comply with ASTM D6757 and manufactured to meet all the performance requirements of ASTM D226 and ASTM D4869, including resistance to liquid water transmission.

LEED® is a registered trademark of U.S. Green Building Council.