GAF DensDeck Prime Roof Board, 5/8 in x 4 ft x 8 ft

GAF DensDeck Prime Roof Board, 5/8 in x 4 ft x 8 ft

Regular price $1,197.90

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DensDeck Prime Roof Board (5/8 in, 4x8)

Commercial-grade gypsum roof board with glass mat facings and a pre-primed surface for stronger membrane adhesion. Designed to serve as fire, recovery, and thermal barrier while improving flute spanning and deck stability.


Key Features:

  • Pre-Primed Surface: Enhances bond strength with roofing membranes for faster, reliable adhesion
  • Durable Glass-Mat Facings: Resists deterioration, delamination, warping, and job-site damage
  • Fire and Wind Performance: Provides excellent fire resistance and wind uplift properties
  • Structural Support: Superior flute spanning helps stiffen and stabilize the roof deck
  • Commercial Roofing Ready: Functions as fire barrier, recovery board, and thermal barrier across systems

Specifications Table:

Specification Details
Manufacturer Part Number 50D8
Product Number GAF06DDP
Board Dimensions 4 ft x 8 ft
Thickness 5/8 in
Item Weight 80 lb
Style Roofing Insulation
Construction Glass mat facings with treated gypsum core
Surface Pre-primed
Functions Fire barrier, recovery board, thermal barrier
Performance Superior flute spanning; improves deck stiffness and stability
Resistance Moisture and water resistant; resists deterioration, delamination, warping, job-site damage
Standards/Approvals ASTM C518; ASTM D3273; ASTM E84; ASTM E96; ASTM E119; ASTM E661; UL723; ASTM C578; ASTM C177; UL Class A; ULC S-102; FMRC Class 1; ULC 102; UL Classified; Florida Building Code Approved

Frequently Asked Questions (FAQ):

Q: What are the board dimensions and thickness?
A: This variant is 4 ft x 8 ft with a 5/8 in thickness.


Q: Is the surface pre-primed?
A: Yes, the board features a pre-primed surface to improve membrane adhesion.


Q: What applications is this board suited for?
A: It serves as a fire barrier, recovery board, and thermal barrier in various commercial roofing systems.


Q: How does it handle moisture?
A: The treated gypsum core and glass-mat facings provide water and moisture resistance.


Q: What standards does it meet?
A: Listed standards include ASTM C518, D3273, E84, E96, E119, E661; UL723; ASTM C578, C177; UL Class A; ULC S-102; FMRC Class 1; ULC 102; UL Classified; Florida Building Code Approved.


A Refined Backbone for High-Performance Roofs

This board brings quiet strength to the envelope—sleek, resilient, and impeccably engineered. The pre-primed, glass-mat surface is a subtle yet powerful detail that ensures a seamless bond under modern roofing membranes. Pair it with minimalist single-ply systems to create a clean, monolithic rooftop profile. It’s an essential layer for a polished, durable, and luxuriously reliable build.


Choose DensDeck Prime to strengthen your roof assembly with superior adhesion, durability, and code-compliant performance.

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