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GMC 30# Felt Underlayment, 2 Squares per Roll, ASTM D4869
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GMC 30# Felt Underlayment, 2 Squares per Roll, ASTM D4869
GMC 30# Felt Underlayment is asphalt-saturated roofing felt meeting ASTM D4869, supplied in rolls covering 2 squares (200 sq. ft.). It installs over roof decking beneath shingles as a secondary water-shedding layer. One sell unit is one roll.
Key Features:
- ASTM D4869 compliant: Manufactured to meet ASTM D4869 for asphalt-saturated felt underlayment.
- 30# weight class: Heavy 30# felt offers a robust secondary layer under shingles.
- 2 squares per roll: Each roll covers 200 sq. ft. of roof deck.
- Wide compatibility: Works beneath standard asphalt shingle roof systems.
- Roll format: Supplied in rolls for fast, efficient deck coverage.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | GMC |
| Sell unit | 1 roll, 2 squares (ASTM D4869) |
| Product line | GMC Felt 30# |
| Material | Asphalt-saturated felt (No. 30) |
| Nominal size | 2 squares per roll (200 sq. ft.) |
| Coverage per unit | 2 squares (200 sq. ft.) per roll |
| Standard | ASTM D4869 |
| Intended use | Residential roofing underlayment beneath shingles |
| Assembly | Unrolled and fastened over roof deck, shingle courses lapped per code and manufacturer instructions |
Coverage & How Much You Need:
One roll covers 2 squares, or 200 sq. ft. of roof deck. Divide the total roof area in squares by 2 and add rolls for lap and waste allowance.
Fit and Compatibility:
Designed as an underlayment beneath asphalt shingle roofing on residential slopes. Starter strip, shingles, ridge caps and fasteners are sold separately; verify slope and lap requirements with the shingle manufacturer's installation instructions.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One roll of GMC 30# felt underlayment covering 2 squares, meeting ASTM D4869.
Q: How much does one roll cover?
A: Each roll covers 2 squares, or 200 sq. ft., before lap allowances.
Q: What standard does it meet?
A: It meets ASTM D4869 for asphalt-saturated felt underlayment.
Q: Where is it used?
A: As underlayment over roof decking beneath asphalt shingles in residential roofing.
Q: How is it installed?
A: Roll it out over the deck, lap courses per code and shingle manufacturer instructions, and fasten with cap nails or caps.
Q: How many rolls do I need?
A: Divide your roof area in squares by two, then add extra for laps, valleys and waste.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Thirty-pound felt is a dependable, code-recognized underlayment choice for pitched shingle roofs and a good backup layer in storms. Keep rolls dry and flat before installation, and do not leave felt exposed to weather longer than the shingle manufacturer allows. On low slopes or in high-wind regions, check whether the shingle system calls for a synthetic underlayment or double-felt coverage instead.
Felt underlayment is slippery, especially when wet or dusty; wear soft-soled shoes with good grip, use roof anchors on steep slopes, and keep the deck surface clean while working.
Order GMC 30# Felt Underlayment rolls meeting ASTM D4869 for your next shingle roof.
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