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

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

Regular price $1,197.90

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

High-performance gypsum roof board with glass-mat facings and a pre-primed surface for stronger adhesion in commercial roofing systems. Engineered to resist fire, moisture, and wind uplift while improving flute spanning and deck stability.


Key Features:

  • Pre-Primed Surface: Enhances bond strength with roofing membranes and adhesives
  • Durable Construction: Glass-mat facings embedded in a moisture-resistant treated gypsum core
  • Fire and Wind Performance: Designed for excellent fire resistance and wind uplift properties
  • Stability and Support: Superior flute spanning helps stiffen and stabilize roof decks
  • Damage Resistant: Resists deterioration, delamination, warping, and job-site damage compared to paper-faced gypsum, fiberboard, and perlite

Specifications Table:

Specification Details
Product Name DensDeck Prime Roof Board
Brand GAF
Dimensions 4' x 8'
Thickness 5/8"
Item Weight 80 lb
Style Roofing Insulation
Manufacturer Number 50D8
Product Number GAF06DDP
Unit of Measure SQ | PC
Applicable Standards ASTM C518; ASTM D3273; ASTM E84; ASTM E96; ASTM E119; ASTM E661; UL 723; 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 and 5/8 in thick.


Q: Is the surface ready for membrane installation?
A: Yes, it features a pre-primed surface to improve adhesion to roofing membranes and adhesives.


Q: Can it be used as a thermal barrier?
A: Yes, it functions 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 with glass-mat facings provides moisture resistance and helps prevent warping and delamination.


Q: What standards does it meet?
A: Listed standards include ASTM C518, D3273, E84, E96, E119, E661, C578, C177; UL 723; UL Class A; ULC S-102; FMRC Class 1; ULC 102; UL Classified; Florida Building Code Approved.


A Prime Foundation for Sleek, Resilient Roofscapes

DensDeck Prime brings a refined, tailored edge to the roof—its glass-mat surface is both elegant and engineered. The pre-primed finish is a quiet powerhouse, creating a seamless bond for membranes while elevating performance. Pair it with a minimalist single-ply system to underscore clean lines and confidence. It’s a sophisticated essential for resilient, luxurious commercial envelopes.


Strengthen your roofing system with DensDeck Prime—choose the 5/8 in 4x8 board for superior adhesion, durability, and fire performance.

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