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DensDeck Primed Gypsum Roof Cover Board, 4 ft. x 8 ft. Sheet
Regular price $42.67Orders start at $399 — combine any items to reach the minimum. Learn more
DensDeck Primed Gypsum Roof Cover Board, 4 ft. x 8 ft. Sheet
DensDeck Primed is a gypsum roof cover board supplied as a 4 ft. x 8 ft. sheet, sold by the sheet. It is installed over roof insulation to provide a flat, durable substrate for membrane systems and comes in 1/2 in. and 5/8 in. thicknesses with a primed brown surface. Pair it with compatible roofing membranes and adhesives for a complete low-slope roof assembly.
Key Features:
- Gypsum core strength: The board uses a gypsum core engineered for use as a roof cover board under membrane roofing.
- Primed surface: Each sheet has a primed brown face that prepares the board for adhesives and coatings.
- Standard sheet size: Sheets measure 4 ft. x 8 ft., a common size for efficient layout on roof decks.
- Two thicknesses: Available in 1/2 in. and 5/8 in. thicknesses to match project requirements.
- Sold per sheet: Each order unit is one full sheet for easy quantity takeoffs.
- Membrane substrate: Creates a smooth, firm surface for bonding single-ply membranes and insulation layers.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | DensDeck |
| Sell unit | 1 sheet, 4 ft. x 8 ft. |
| Product line | DensDeck |
| Available colors | ['Brown'] |
| Available sizes | ['1/2 in. x 4 ft. x 8 ft.', '5/8 in. x 4 ft. x 8 ft.'] |
| Material | Gypsum |
| Finish / texture | Primed |
| Dimensions | 4 ft. x 8 ft. sheet |
| Coverage per unit | 32 sq. ft. per sheet |
| Intended use | Roof cover board over insulation under roofing membranes |
Coverage & How Much You Need:
Each 4 ft. x 8 ft. sheet covers 32 sq. ft. of roof area before allowances for seams and waste. Estimate your roof area in square feet, divide by 32, and add a waste factor for cuts.
Fit and Compatibility:
DensDeck cover board is installed over approved roof insulation and beneath Johns Manville and other compatible single-ply or bituminous membrane systems. Fasteners, adhesives and insulation boards are sold separately.
Frequently Asked Questions (FAQ):
Q: What is included with my order?
A: One primed DensDeck gypsum cover board sheet, 4 ft. x 8 ft., in your chosen thickness.
Q: How many sheets do I need?
A: Each sheet covers 32 sq. ft., so divide your roof area by 32 and add extra for cuts and waste.
Q: Which thickness should I choose?
A: Both 1/2 in. and 5/8 in. sheets serve as cover board; choose the thickness specified in your roof assembly design.
Q: Does it need priming before installation?
A: The sheets arrive primed, so they are ready for adhesive attachment and membrane installation.
Q: Is it rated for specific wind or fire performance?
A: No ratings are stated in the available sources; consult the manufacturer's technical literature for tested assemblies.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Cover board is specified for its ability to protect foam insulation and improve membrane performance; select 5/8 in. where assembly specs call for thicker board. Keep sheets dry on the job site and fully support joints over insulation. Follow the membrane manufacturer's attachment pattern for fasteners or adhesive.
Follow local building and fire codes and the membrane manufacturer's assembly requirements when installing roof cover board.
Order DensDeck Primed gypsum roof cover board in 1/2 in. or 5/8 in. sheets for your next roofing project.
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