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GMC 15# Asphalt Felt Underlayment, 4 Square Roll
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GMC 15# Asphalt Felt Underlayment, 4 Square Roll
GMC 15# felt underlayment is a traditional asphalt-saturated organic felt used beneath shingle, tile and metal roofing. Each sell unit is one roll covering 4 squares (400 sq. ft. nominal). It is available in a standard grade and an ASTM D4869-compliant grade, and pairs with any primary roofing membrane system.
Key Features:
- ASTM-compliant option: An ASTM D4869 version is offered for jobs specifying that standard.
- 4-square roll: Each roll covers 4 squares of roof area.
- Two grades: Offered in both STD and ASTM D4869 variants.
- Traditional felt: Classic 15# asphalt-saturated felt for steep-slope roofs.
- Wide compatibility: Works under common shingle, tile and metal roof coverings.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | GMC |
| Sell unit | 1 roll, 4 square |
| Product line | GMC Felt 15# |
| Available sizes | 4 Square/Roll (both variants) |
| Material | Asphalt-saturated felt underlayment |
| Coverage per unit | 4 squares (400 sq. ft.) per roll |
| Approvals | ASTM D4869 (D4869 variant) |
| Intended use | Roofing underlayment beneath shingles, tile or metal |
Coverage & How Much You Need:
One roll covers 4 squares, or 400 sq. ft. nominal. Divide total roof area by 400 to estimate rolls needed, then add laps and waste per fastening and overlap requirements of the roof covering.
Fit and Compatibility:
Designed for use under shingle, clay tile, concrete tile and metal roofing as the water-shedding layer over the deck. Choice between the STD and ASTM D4869 grades depends on the job specification.
Frequently Asked Questions (FAQ):
Q: What is included in each roll?
A: Each sell unit is one 4-square roll of 15# asphalt felt.
Q: Which grade should I order?
A: Order the ASTM D4869 variant when a specification or code calls for that standard; the STD grade is the conventional 15# felt.
Q: How many rolls do I need?
A: Divide your roof area by 400 sq. ft. per roll and add extra for laps and waste.
Q: How is it installed?
A: Roll it out over the roof deck and fasten per the roof covering manufacturer's requirements before installing the finish roof.
Q: Is a weight or UPC published?
A: No roll weight or UPC is published in the available sources.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
As a roofing-supply expert, I recommend the ASTM D4869 roll whenever the spec sheet names that standard, since inspectors may ask for it. Felt remains a cost-effective underlayment for steep-slope asphalt shingle jobs; keep rolls dry until install and lap per the shingle exposure in your local code. Order extra rolls for hips, valleys and starter laps.
Install underlayment on dry decks and use fall protection when working on roofs, following OSHA and local requirements.
Order GMC 15# felt underlayment rolls today for dependable coverage under your next roof.
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