Description
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.
