DensDeck Prime 5/8 in. Roof Board (4x4)

Engineered glass-mat faced gypsum roof board designed for superior adhesion with a wide range of roofing systems. Ideal as a cover board for adhered and self-adhered membranes, modified bitumen, and single-ply applications, delivering strength, uniform adhesive application, and reliable fire and wind performance.

Key Features:

• Enhanced Adhesion: Face mat formulation promotes uniform adhesive application and stronger bonds with many roofing adhesives.
• Versatile Compatibility: Suitable for adhered/self-adhered, hot-mopped, cold mastic, and torch-applied modified bitumen and single-ply systems.
• Installation Efficiency: Can reduce adhesive/mastic usage and may eliminate the need for field primer, lowering installed cost.
• Durable Construction: Glass-mat faced gypsum core provides rigidity and impact resistance for long-term roof performance.
• Code Compliant: Meets ASTM C1177 with UL 790/1256 classifications, FM Class 1 approvals, and Florida/Miami-Dade approvals.

Please check the Product Data Sheet Here

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What are the board dimensions and thickness?
A: Each panel measures 4 ft. x 4 ft. with a 5/8 in. thickness.

Q: Can this be used under single-ply membranes?
A: Yes. It is designed for adhered and self-adhered single-ply systems and demonstrates strong adhesive bonds.

Q: Does it require a primer?
A: The enhanced face mat can potentially eliminate the need for field primer depending on the adhesive and system specification.

Q: What standards and approvals does it meet?
A: ASTM C1177; UL 790 and 1256 classifications; FM Class 1 approvals; Florida Building Code; Miami-Dade County approval.

Q: What is the typical weight per board?
A: Approximately 40.8 lb per 4 ft. x 4 ft. panel.

A Sleek, Structural Foundation for High-Performance Roofscapes

With its crisp, graphite-gray face and solid profile, this board brings a tailored precision to the roof plane. The enhanced surface is the quiet hero—inviting adhesives to glide and grip with confidence. Pair it with a clean single-ply membrane to create a refined, modern silhouette from curb to skyline. It’s a smart, luxurious underpinning that elevates both performance and presence.

Choose DensDeck Prime 5/8 in. to streamline installation, boost adhesion, and deliver code-compliant roof performance with confidence.

Warranty

Installation