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Georgia-Pacific DensDeck Roof Board, 5/8 in. x 4 ft x 8 ft, Unprimed
Regular price $1.10Orders start at $399 — combine any items to reach the minimum. Learn more
Georgia-Pacific DensDeck Roof Board, 5/8 in. x 4 ft x 8 ft, Unprimed
Georgia-Pacific DensDeck is a 5/8 in. x 4 ft x 8 ft unprimed gypsum roof board with a non-combustible core, built as a durable cover board under single-ply and other low-slope roofing membranes. Sold per board (MSF), it adds fire resistance, wind uplift resistance and impact strength beneath the membrane.
Key Features:
- Non-combustible core: UL Classified gypsum core for resistance to external fire sources.
- Wind uplift improvement: Improves the roof's ability to resist wind and increases membrane bond strength.
- Foot-traffic toughness: Resists impact from maintenance foot traffic over the life of the roof.
- Dimensional stability: Withstands delamination, deterioration, warping and jobsite damage better than paper-faced gypsum board.
- Standard panel size: 5/8 in. thick, 4 ft x 8 ft panel installs with standard cover-board layout practice.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Georgia-Pacific |
| Sell unit | 1 board, 5/8 in. x 4 ft x 8 ft (sold per MSF) |
| Product line | DensDeck Roof Board |
| Available colors | Gray |
| Available sizes | 5/8 in. x 4 ft x 8 ft |
| Material | Fiberglass-mat faced gypsum roof board, unprimed |
| Thickness | 5/8 in. |
| Dimensions | 4 ft x 8 ft panel |
| Finish / texture | Unprimed |
| Approvals | non-combustible gypsum core |
| Intended use | Roof cover board under low-slope roofing membranes |
Coverage & How Much You Need:
One 4 ft x 8 ft panel covers 32 sq ft of deck area; divide total roof square footage by 32 and add waste for cuts to size the order.
Fit and Compatibility:
Installed over insulation or the roof deck as a cover board beneath single-ply membranes, modified bitumen and other low-slope roofing systems; fasteners or adhesives are sold separately.
Frequently Asked Questions (FAQ):
Q: What size is the board?
A: The board is 5/8 in. thick and measures 4 ft x 8 ft.
Q: How many boards do I need?
A: Each panel covers 32 sq ft; divide your roof area by 32 and add 5-10% for cuts and waste.
Q: Is it fire rated?
A: The gypsum core is non-combustible and the board is UL Classified for resistance to external fire sources.
Q: Why use it under a membrane?
A: It improves wind resistance, increases membrane bond strength and protects the insulation from foot traffic and jobsite damage.
Q: Is the surface primed?
A: No, this is the unprimed version of DensDeck roof board.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
A 5/8 in. cover board is the standard choice when the membrane needs added puncture resistance and wind uplift performance; thinner boards exist but 5/8 in. gives the best foot-traffic protection. Stagger board joints from insulation joints, leave a small gap at panel edges, and attach per the membrane manufacturer's fastening pattern. Choose primed DensDeck only if the system you are installing calls for it.
Gypsum board is heavy and edges are sharp; use two-person carries or mechanical lifts and cut with a utility knife using safe, controlled scoring.
Order Georgia-Pacific DensDeck 5/8 in. roof board to strengthen your next low-slope roofing assembly.
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