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Georgia Pacific DensDeck Roof Board 1/4 in. or 1/2 in. x 4 ft. x 8 ft.
Regular price $39.00Orders start at $399 — combine any items to reach the minimum. Learn more
Georgia Pacific DensDeck Roof Board 1/4 in. or 1/2 in. x 4 ft. x 8 ft.
Georgia Pacific DensDeck is a roof cover board sold in 1/4 in. and 1/2 in. thicknesses, each in 4 ft. x 8 ft. sheets. Installed over rigid roof insulation, it forms a solid, even substrate for roofing membranes and base flashing. Select the thickness specified in your roof assembly.
Key Features:
- Two thicknesses: Available in 1/4 in. and 1/2 in. versions to match assembly specifications.
- Full sheet format: 4 ft. x 8 ft. sheets cover 32 square feet each for efficient roof layouts.
- Cover board role: Provides a stable layer over insulation that supports membrane adhesion and attachment.
- Contractor standard: DensDeck is a widely specified cover board name in commercial low-slope roofing.
- Per-sheet ordering: Sold by the sheet (SH) so you can order exactly what the job requires.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Georgia Pacific |
| Sell unit | 1 sheet, 4 ft. x 8 ft. |
| Product line | DensDeck Roof Board |
| Available colors | Brown |
| Available sizes | 1/4 in. x 4 ft. x 8 ft., 1/2 in. x 4 ft. x 8 ft. |
| Material | Polystyrene (as listed); marketed as DensDeck roof cover board |
| Dimensions | 4 ft. x 8 ft. sheets |
| Thickness | 1/4 in. or 1/2 in. |
| Coverage per unit | 32 sq. ft. per sheet |
| Intended use | Roof cover board over rigid insulation beneath roofing membranes |
| Category | Insulation & Accessories > Rigid Insulation Boards > Roof Cover Boards |
Coverage & How Much You Need:
Each 4 ft. x 8 ft. sheet covers 32 square feet of roof area. Divide the roof area by 32 and add waste allowance for perimeter cuts and penetrations.
Fit and Compatibility:
Installed over rigid roof insulation beneath compatible low-slope membranes. Insulation, fasteners or adhesives, and membrane are sold separately. Verify thickness and attachment pattern against the project specification.
Frequently Asked Questions (FAQ):
Q: What thicknesses are offered?
A: This line includes 1/4 in. and 1/2 in. DensDeck, both in 4 ft. x 8 ft. sheets.
Q: How much does one sheet cover?
A: One sheet covers 32 square feet.
Q: Where does it go in the assembly?
A: Above the insulation and below the membrane, as a cover board and membrane substrate.
Q: How many sheets per square?
A: A 100 sq. ft. square requires just over 3 sheets, plus an allowance for cuts.
Q: What is included in the sell unit?
A: One sheet; fasteners, adhesives, and membrane are separate.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
A cover board is standard practice on commercial roofs to shield insulation and improve membrane performance, and 1/2 in. is the common choice where durability is prioritized. Stagger joints between board courses and between boards and insulation, and attach per the membrane system requirements. Match board thickness to the specified R-value stack and flashing details.
Use two-person lifts or mechanical handling for 4 ft. x 8 ft. boards on rooftops and wear gloves and eye protection when cutting.
Order Georgia Pacific DensDeck roof cover board sheets for a solid membrane substrate.
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