Georgia-Pacific DensDeck

Why We Rep Them

The case for Georgia-Pacific

DensDeck is a four-product line built around one core board, not four unrelated products. Roof Board is the standard glass-mat cover board; Prime adds GP's patented EONIC Technology for enhanced moisture resistance; StormX Prime is the first gypsum cover board FM classified for Very Severe Hail (VSH) under a single-ply membrane; and ProFast Prime trades thickness for weight and fastener savings, cutting fastener counts 25-75% in FM-tested assemblies. Each variant adds moisture, impact, or installation-efficiency performance without changing what the board does — substrate, thermal barrier, recovery board, or cover board under nearly any membrane. Which variant a project needs depends on hail exposure, wind uplift targets, and budget, confirmed per project.

Product Lines

Systems We Specify

DensDeck Roof Board

The industry-standard cover board, since 1987.

Glass mat gypsum that gives roofing assemblies fire and impact resistance polyiso alone can't provide.

DensDeck Roof Board is the original glass mat gypsum cover board, invented by Georgia-Pacific in 1987 and still one of the most widely specified boards in commercial roofing. It's used as a substrate, thermal barrier, recovery board, or cover board under nearly any membrane, adding fire resistance, puncture resistance, and a stable base for tested wind-uplift assemblies.

1987

Invented by Georgia-Pacific

Glass Mat

Non-paper facer

4

Roles — substrate, thermal barrier, recovery, cover

UL/FM

Tested wind-uplift assemblies

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DensDeck Prime

The same board, built to resist moisture longer.

EONIC Technology adds enhanced moisture resistance without changing how the board installs.

DensDeck Prime carries Georgia-Pacific's patented EONIC Technology, engineered for enhanced moisture resistance beyond the standard board — manufactured to 5% total water resistance by weight and 1 gram surface water absorption on both sides. It installs the same way, in the same roles, as the standard board — just built to hold up better against the moisture exposure a roof sees before, during, and after installation.

EONIC

Patented moisture technology

5%

Max total water resistance by weight

1g

Max surface water absorption

Same

Install method as standard board

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DensDeck StormX Prime

Built for hail that breaks other roofs.

The first gypsum cover board FM classified for Very Severe Hail in a single-ply membrane assembly.

DensDeck StormX Prime is FM classified for Very Severe Hail (VSH) — the highest hail rating FM tests for — and was the first gypsum cover board to earn that classification under a single-ply membrane, using a standard adhered membrane bareback assembly. It carries the same EONIC Technology moisture resistance as Prime, layered with enhanced impact resistance for buildings in severe hail or hurricane-prone regions.

VSH

FM Very Severe Hail classified

1st

To pass VSH under single-ply TPO

EONIC

Same moisture technology as Prime

Highest

FM hail impact rating tested

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DensDeck ProFast Prime

Fewer fasteners, lighter boards, faster installs.

About 20% lighter than 1/2" DensDeck Prime, with FM testing showing a 25-75% cut in fasteners on partially-adhered single-ply assemblies.

DensDeck ProFast Prime carries the same EONIC Technology moisture resistance as Prime, at a thinner 3/8" profile that's roughly 20% lighter than the 1/2" board — easier to carry, faster to install, and up to 25% more boards per truckload. FM testing on multiple assemblies using #15 fasteners and 3" plates showed a 25% to 75% reduction in the number of fasteners needed on partially-adhered single-ply roofs, without giving up fire, wind uplift, puncture, or hail resistance.

20%

Lighter than 1/2" DensDeck Prime

25–75%

Fewer fasteners (FM tested)

3/8"

Board thickness

25%

More boards per truckload

Let's get your DensDeck spec right.

RRI is your DensDeck rep for Southern California — spec review, submittals, and warranty support from one team, start to finish.

Resources

Technical Documents

Need data sheets, specifications, installation details, or warranty information for Georgia-Pacific DensDeck? Tell us the product and application and we'll send the current documents straight from the manufacturer.

Other Lines