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Tarco 15# ASTM D226 Organic Felt Underlayment, 4 Squares per Roll
Regular price $52.50Orders start at $399 — combine any items to reach the minimum. Learn more
Tarco 15# ASTM D226 Organic Felt Underlayment, 4 Squares per Roll
Tarco Felt 15# is ASTM D226 No. 15 organic felt underlayment supplied in rolls covering 4 squares. It installs horizontally from the bottom of the roof deck beneath asphalt shingles. Each order unit is one roll.
Key Features:
- ASTM D226: Manufactured to ASTM D226 as 15# organic felt underlayment.
- 4 squares per roll: Each roll covers 4 roofing squares (400 sq. ft. nominal).
- Organic felt: Traditional organic felt construction for steep-slope underlayment.
- Horizontal install: Organic felt rolls must be installed horizontally, starting from the bottom of the roof deck.
- Shingle underlayment: Serves as the felt underlayment layer beneath asphalt shingle roofing.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Tarco |
| Sell unit | 1 roll, 4 squares |
| Product line | Tarco Felt 15# |
| Material | Organic felt |
| Available sizes | 15# ASTM D226, 4 squares per roll |
| Standard | ASTM D226 |
| Coverage per unit | 4 squares (roll) |
| Installation | Horizontal, from the bottom of the roof deck |
| Intended use | Residential roof underlayment beneath shingles |
Coverage & How Much You Need:
One roll covers 4 squares (400 sq. ft. nominal) before laps. Divide your roof area by 4 squares per roll and add rolls for horizontal lap allowances, which reduce effective coverage.
Fit and Compatibility:
Used as the felt underlayment layer under asphalt shingle roof systems. Pair with shingles, starter and ridge products from the same roofing assembly; head laps and side laps should follow the shingle manufacturer's specifications.
Frequently Asked Questions (FAQ):
Q: What is included?
A: Each order is one roll of Tarco 15# ASTM D226 organic felt underlayment covering 4 squares.
Q: How many rolls do I need?
A: Divide roof area by 4 squares per roll and add extra for laps at horizontal courses.
Q: How is it installed?
A: Organic felt rolls must be installed horizontally, starting from the bottom of the roof deck and lapping courses shingle-style.
Q: What standard does it meet?
A: It is listed as ASTM D226 15# felt.
Q: Is it self-adhering?
A: No, it is a mechanically fastened organic felt; use a separate self-adhered product where ice and water protection is required.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
No. 15 felt remains a cost-effective underlayment for standard slopes and dry-weather installs. Keep rolls dry before and during installation because organic felt can wrinkle when wet. Install horizontally from the eaves up with the laps specified by the shingle manufacturer, and step up to synthetic or self-adhered underlayment on low slopes or long exposure windows.
Felt underlayment is slippery, especially when wet or dusty; wear proper footwear and use fall protection on the roof deck.
Order Tarco 15# ASTM D226 felt underlayment in 4-square rolls for your next shingle roof.
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