GAF Dens-Deck Prime Roof Cover Board 1/2 in. x 4 ft. x 8 ft. Sheet
Pre-primed gypsum roof cover board sheet
GAF Dens-Deck Prime is a pre-primed gypsum roof cover board designed to provide a durable, high-performance surface for commercial roofing assemblies. It helps improve bonding for membranes and can serve as an effective fire and thermal barrier layer in many roof systems.
Key Features:
- Pre-Primed Surface: Factory-primed facing helps promote stronger bond performance for roofing membranes and adhesives.
- Fire & Thermal Barrier Layer: Designed to perform as an exceptional fire barrier and thermal barrier in roofing assemblies.
- Durable Cover Board Protection: Adds protection against punctures and jobsite abuse compared with using insulation alone.
- Moisture-Resistant Design: Engineered for enhanced moisture resistance to support long-term roof assembly performance.
- Commercial Roof System Compatibility: Intended for use as a cover board/re-cover board in a variety of commercial roofing applications.
Specifications Table:
| Specification | Details |
|---|---|
| Product name | GAF 1/2″ Dens-Deck Prime 4X8 |
| SKU | 62GADDP128 |
| Category | Insulation & Weatherproofing |
| Subcategory | Roof Cover Boards |
| Unit of measure | SH – Sheet |
| Nominal thickness | 1/2 in. |
| Nominal size | 4 ft. x 8 ft. |
| Product type | Cover board / re-cover board |
| Surface | Pre-primed |
| Performance description | Exceptional fire barrier, thermal barrier, and re-cover board; pre-primed surface to make the bond even stronger. |
| Core/facing (supplementary) | Fiberglass mat with high-density gypsum core (described with EONIC technology). |
| Flame spread & smoke developed (supplementary) | 0/0 when tested to ASTM E84. |
| Water absorption by weight (supplementary) | 5% max. |
| Surface water absorption (supplementary) | 1.0 gram nominal (both sides). |
| Permeance (supplementary) | >30 perms (>1710 ng/Pa•s•m²). |
| Compressive strength (supplementary) | 900 psi nominal. |
| Mold resistance (supplementary) | 10/10. |
| R-value (supplementary) | 0.28 (°F•ft²•hr/BTU). |
| Flexural strength, parallel (supplementary) | ≥40 lbf (178 N). |
| Bending radius (supplementary) | 4 ft (1219 mm). |
| Width tolerance (supplementary) | 4 ft (1219 mm) ± 1/8 in (3 mm). |
Frequently Asked Questions (FAQ):
Q: What size is each sheet?
A: Each board is 4 ft. x 8 ft. and sold as a sheet.
Q: What is the thickness?
A: This product is 1/2 inch thick.
Q: What is Dens-Deck Prime typically used for?
A: It’s used as a commercial roof cover board/re-cover board to provide a durable, bond-friendly surface under roofing membranes.
Q: Does it have a primed surface?
A: Yes—Dens-Deck Prime has a pre-primed surface intended to enhance bonding.
Q: What material is it made from?
A: Supplementary product information describes it as a fiberglass-mat, high-density gypsum-core roof board.
A Quiet Foundation for Bold Rooflines
Think of this cover board as the unseen couture understructure of a roof—clean, composed, and engineered to elevate everything layered above it. The pre-primed surface is the detail that matters, creating a more confident bond and a crisper finish for high-performance membranes. Use it to refine the build-up in demanding commercial projects where durability and resilience can’t be negotiable. It’s the kind of essential that makes “luxury” feel effortless—because it’s built into the bones.
Choose GAF Dens-Deck Prime to add a tough, pre-primed cover board layer that helps strengthen membrane bonding and protect your roof assembly.
Reviews
"Shipping was faster than I expected. The zipper glides without catching. I've had it on the kitchen counter daily. Scent is lighter than I pictured, which I prefer anyway. Shipping was quick and the item delivered."
"The team was responsive when I reached out. Cushioning is supportive after hours. I've been using it daily for about two weeks now. Slightly heavier than expected, still well balanced though. I'm in San Diego, CA. Glad I went with this one."
"Bought the starter kit and the fabric is surprisingly breathable. Took it to the lake house for the weekend. Instructions could be a bit clearer, but I figured it out. I'm in Tampa, FL. Glad I went with this one."
"Shipping was faster than I expected. Took it to the lake house for the weekend. Wish it came in more colors, otherwise great. I'm in Milwaukee, WI. Glad I went with this one."
"Came earlier than the promised date. The color matched the listing exactly. Used it on my commute all month. Took a minute to snap together, fits great now. Five stars from me."
"Packaging was secure and nothing moved. The color matched the listing exactly. Tested it through a full week of rain. Definitely a repeat customer after this."
"Chose the king size and the build quality is better than the photos suggested. Used it during a move and nothing shifted. Five stars from me."
"Got the navy version and the material feels solid and well-made. It's been on my nightstand since it arrived. Definitely a repeat customer after this."
"Got the white finish and the build quality is better than the photos suggested. Carried it through a busy work week. Definitely a repeat customer after this."
"Chose the king size and the zipper glides without catching. It lives in my gym bag now. Worth the money."
