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G.A.P. 43# Organic Base Sheet D, ASTM D2626-04, 36 in. Asphalt Base Roll
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G.A.P. 43# Organic Base Sheet D, ASTM D2626-04, 36 in. Asphalt Base Roll
G.A.P. 43# Organic Base Sheet D is an asphalt-saturated organic felt base sheet for built-up roofing, applied over flat roof decks or insulation before the BUR membrane. It meets or exceeds ASTM D2626-04 and is Florida Building Code approved. Each roll is 36 in. wide and covers 2 squares.
Key Features:
- BUR Base Sheet: Applied over the flat roofing deck or insulation before the application of built-up roofing systems.
- Meets ASTM D2626: Meets or exceeds ASTM D2626-04 for organic base sheets.
- Florida Code Approved: A Florida Building Code approved product.
- Quality Felt Core: Manufactured from superior quality felt saturated with asphalt.
- Weathering Coating: Coated on both sides with weathering grade coating asphalt.
- 36 in. Width: 36 in. wide for quick application.
- No-Stick Surface: Covered on top with mineral surface fines to prevent sticking in the roll.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | G.A.P. |
| Sell unit | 1 roll, 36 in. wide, 2 squares |
| Product line | G.A.P. Organic Base Sheet D |
| Material | Asphalt-saturated organic felt |
| Dimensions | 36 in. wide roll |
| Coverage per unit | 2 squares per roll |
| Approvals | Meets or exceeds ASTM D2626-04; Florida Building Code approved |
| Intended use | Base sheet over flat roofing decks or insulation under built-up roofing systems |
| Finish / texture | Mineral surface fines on top face |
Coverage & How Much You Need:
One roll covers 2 squares (200 sq. ft.) at 36 in. width before laps. Divide the roof area by 200 sq. ft. per roll and add for head laps and end laps per your BUR specification.
Fit and Compatibility:
Installed as the base layer over flat roof decks or insulation, then covered with built-up roofing plies and surfacing. Nailed and mopped or adhered per the BUR system specification.
Frequently Asked Questions (FAQ):
Q: How much does one roll cover?
A: One 36 in.-wide roll covers 2 squares (200 sq. ft.) before laps and waste.
Q: What is this product used for?
A: It is the base sheet applied over a flat roofing deck or insulation before installing a built-up roofing system.
Q: What standards does it meet?
A: It meets or exceeds ASTM D2626-04 and is a Florida Building Code approved product.
Q: Why is there mineral on the surface?
A: Mineral surface fines cover the top side to prevent the sheet from sticking in the roll.
Q: How is it installed?
A: It is applied over the deck or insulation and fastened, then the BUR plies are applied over it per the system specification.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
A 43# organic base sheet like this one gives BUR systems a uniform, nailable substrate over decks and insulation. Run it with proper head and end laps, fasten on the specified pattern, and dry it in before mopping plies. Choose this D-grade, ASTM D2626-compliant sheet when the spec calls for organic base and code approval matters, particularly in Florida.
Roll out and handle asphalt sheets carefully on the roof, wear gloves, and follow hot-mopping or adhesive safety procedures during BUR installation.
Start your BUR system right with G.A.P. 43# Organic Base Sheet D.
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