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®
®
DURO-GUARD DENSDECK PRIME
5/8-INCH ROOF BOARD

Description Moisture Management
®
DensDeck Prime Roof Board has been enhanced to DensDeck Prime Roof Boards, like other
provide a broader compatibility and higher components used in roofing systems, must be
performance with roofing adhesives. Face mat protected from exposure to moisture before,
enhancements allow adhesives to be applied more during and after installation.
uniformly and consistently. DensDeck Prime Roof
Boards reduce the amount of mastic or adhesive Remove the plastic packaging from all DensDeck
used and potentially eliminates field primers. The Prime Roof Board immediately upon receipt of
DensDeck Prime Roof Board design employs delivery. Failure to remove the plastic packaging may
fiberglass mats front and back that are mechanically result in entrapment of condensation or moisture.
bonded to a high density gypsum core, providing DensDeck Prime Roof Board stored outside must be
excellent fire resistance and wind uplift properties. stored level and off the ground and protected by a
The unique construction of DensDeck Prime Roof breathable waterproof covering. Provide means for air
Board provides superior flute spanning that stiffens circulation around and under stored bundles of
and provides increased foot traffic resistance to the DensDeck Prime Roof Board. DensDeck Prime Roof
roof deck. Additionally, DensDeck Prime Roof Board Board must be covered the same day as installed.
has been shown to withstand delamination,
deterioration and job-site damage far more effectively Avoid application of DensDeck Prime Roof Boards
than roofing membrane substrates such as during rain, heavy fog and any other conditions that
paperfaced gypsum board, fiberboard and perlite may deposit moisture on the surface, and avoid the
insulation. overuse of non-vented, direct-fired heaters during
winter months. When roofing systems are installed on
Primary Uses newly poured concrete or light weight concrete decks
DensDeck Prime Roof Board can be used as a or when re-roofing over an existing concrete deck, a
recovery board and overlayment protection board for vapor barrier should be installed above the concrete
polyisocyanurate and polystyrene insulation. to limit the migration of water from the concrete into
the roof assembly. Always consult a design authority
Standards and Code Approvals for specific instructions for applying other products to
DensDeck Prime Roof Boards are manufactured to DensDeck Prime Roof Boards.
meet ASTM C1177 and have the following approvals:
• Florida Product Approved Moisture vapor movement by convection must be
• Miami-Dade County, Product Control Approved eliminated, and the flow of water by gravity through
imperfections in the roof system must be controlled.
Recommendations and Limitations After a leak has occurred, no condensation on the
DensDeck Prime Roof Boards are manufactured to upper surface of the system should be tolerated, and
act with a properly designed roof system following the water introduced by the leak must be dissipated
good roofing practices. The actual use of DensDeck to the building interior in a minimum amount of time.
Prime Roof Board as a roofing component in any
system or assembly is the responsibility of the roofing Although DensDeck Prime Roof Boards are
system’s design authority. Consult with the engineered with fiberglass facings and high density
appropriate design authority for system and assembly gypsum cores, the presence of free moisture can
specifications and instructions on applying other have a detrimental effect on the performance of the
products to DensDeck Prime Roof Board. product. Moisture accumulation may also significantly
decrease wind uplift and vertical pull resistance in the
DensDeck Prime Roof Boards should not be system or assembly. DensDeck Prime Roof Boards
subjected to abnormal or excessive loads or foot containing excessive free moisture content may need
traffic, such as, but not limited to, use on plaza decks to be evaluated for structural stability to assure wind
or under steel-wheeled equipment that may fracture uplift performance.
or damage the panels. Provide suitable roofing
system protection when required.

www.duro-last.com 1 of 2 800-248-0280
Duro-Last, Duro-Guard and “World’s Best Roof” are registered marks owned by Duro-Last, Inc.
DensDeck is a registered mark owned by Georgia-Pacific Gypsum LLC. RoofNav is a registered mark owned by FM Global.
Created: 01/07/2015