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DensDeck Prime Roof Board Demonstrates Greater Flexural Strength and Pull-Through Resistance



Plus Better Scoring, Snapping and Ease of Handling

Boost Efficiency on Job Site




Atlanta – Georgia-Pacific Gypsum’s recently enhanced DensDeck® Prime Roof Board has demonstrated – in third-party tests–significant attributes that boost job site efficiency.


DensDeck Prime ¼” fiberglass mat gypsum cover boards demonstrated 2.5 times greater flexural strength, per ASTM C473 test methodology, compared to competitive ¼” gypsum fiber boards. The tests were conducted by PRI, Construction Materials Technologies, earlier this year.


For contractors using DensDeck Prime, the advantage of flexural strength (the ability of a material to withstand bending loads) is that it boosts efficiency on the job site. “Flexural strength is an important factor for efficient cover board installation,” said Todd Kuykendall, director of Product Management, Georgia-Pacific Gypsum. “The independent testing confirmed what we suspected – DensDeck Prime boards have greater flexural strength than other boards, making them more durable when transported and installed, thus providing significant advantages for contractors.”



Additionally, ¼” DensDeck® Prime roof board demonstrate 22% more pull-through resistance than ¼” gypsum fiber boards in the fastener system* tested, and are included in more roofing assemblies with RoofNav® approvals for wind uplift performance as a cover board than competitive gypsum fiberboard.


Specific attributes include ease in handling, easy scoring and snapping with no special tools required, which means less breakage and waste -- all of which can lead to significant time and potential money savings.


The overall durability and performance of DensDeck Prime—demonstrated in its fire resistance, strength, pull-through resistance, dimensional stability and mold resistance-- provides a number of other advantages for contractors.


For instance, in adhered, single-ply membrane testing, enhanced DensDeck Prime demonstrated an average of 24 percent better bond strength than the original product, when using solvent-based adhesives. (The average is based on 60 sq. ft./gal. coverage rates.) With adhesives applied more smoothly and consistently, contractors gain potential cost savings on the amount of adhesive used and the labor needed to apply it.  Also, the mat edge wrap is on the underside of the board, allowing for smoother application of adhesive and a more aesthetically appealing appearance once the membrane is laid down.



*3 inch insulation plates and #12 fasteners


Even more important to roofing contractors is that DensDeck Prime is the first and only fiberglass-mat gypsum roof board with a 90-day parapet warranty for exposure.  The parapet application can be left uncovered, while the horizontal application of product is being completed.


For more information about the family of DensDeck roof boards, please visit

About DensDeck® Roof Boards

With billions of square feet installed in a complete range of roofing systems and climate extremes, DensDeck® Roof Boards have proven their toughness and versatility. DensDeck Prime Roof Boards combine the superior features of DensDeck Roof Boards (fire resistance, strength and dimensional stability) with an enhanced surface treatment. Its coated surface of DensDeck Prime provides an ideal substrate for a wide variety of adhered roofing systems by allowing a uniform spread of adhesives, which results in a strong, consistent bond. DensDeck Prime can be used in cold mastic, torch-applied modified bitumen as well as fully-adhered, single-ply systems. DensDeck Prime Roof Boards are resistant to mold growth, and have scored a rating of 10, the highest level of performance for mold resistance under the ASTM D 3273 test method.  For more information, please visit or

More From 4/14/2014 on FacilitiesNet