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GMC 39.25 in. 30# Felt Underlayment, ASTM D-226, 2 Square Roll
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GMC 39.25 in. 30# Felt Underlayment, ASTM D-226, 2 Square Roll
GMC 30# organic felt underlayment is a 39.25 in. wide roll covering 2 squares (216 sq ft), meeting ASTM D 226-05 Type II and ASTM D 4869-05 Type IV. Each order is one roll weighing about 18 lb. Use it as asphalt-shingle underlayment beneath shingle courses.
Key Features:
- Meets ASTM D 226: Conforms to ASTM D 226-05 Type II specification.
- ASTM D 4869 Type IV: Also meets ASTM D 4869-05 Type IV requirements.
- 2 square roll: Covers 216 sq ft per roll for efficient estimation.
- 39.25 in. width: Wide format reduces the number of courses.
- UL listed accessory: Meets UL Specifications for Prepared Roofing Accessory as printed.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | GMC |
| Sell unit | 1 roll, 39.25 in. x 2 squares (216 sq ft) |
| Product line | 30# Felt |
| Dimensions | 39.25 in. wide roll |
| Coverage per unit | 216 sq ft (2 squares) |
| Material | 30# organic felt |
| Approvals | ASTM D 226-05 Type II; ASTM D 4869-05 Type IV; UL Specifications for Prepared Roofing Accessory |
| Weight | 18 lb per roll |
| Intended use | Asphalt shingle roof underlayment |
Coverage & How Much You Need:
One roll covers 2 squares, 216 sq ft, at nominal 39.25 in. width. Effective coverage is slightly less after laps; calculate rolls as roof squares divided by 2, then add 10-15% for lap and waste per manufacturer instructions and local code.
Fit and Compatibility:
Used beneath asphalt shingles and as a general-purpose roofing underlayment. Shingle starter course, fasteners and cap nails are sold separately. Verify that the shingle manufacturer approves organic felt underlayment for the warranty.
Frequently Asked Questions (FAQ):
Q: How much area does one roll cover?
A: One roll covers 216 sq ft, or 2 squares, before lap deductions.
Q: What standards does it meet?
A: ASTM D 226-05 Type II, ASTM D 4869-05 Type IV, and UL Specifications for Prepared Roofing Accessory.
Q: How wide is the roll?
A: The roll is 39.25 in. wide.
Q: How much does a roll weigh?
A: Approximately 18 lb per roll.
Q: What fasteners should I use?
A: Use cap nails or cap staples per the underlayment and shingle manufacturer's instructions; fasteners are sold separately.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Thirty-pound felt is a common choice for code-minimum shingle underlayment; order about half as many rolls as roof squares plus waste allowance. Lap horizontal courses 2-4 in. and end laps per the manufacturer's instructions and local code. In high-wind regions, check whether the shingle manufacturer requires a synthetic underlayment instead.
Felt underlayment is slippery, especially on slopes or when wet; wear soft-soled slip-resistant footwear and use proper fall protection.
Order the GMC 30# ASTM D-226 felt underlayment roll for your next shingle roof.
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