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DURO-GUARD DENSDECK ®

1/4-INCH ROOF BOARD

Description Moisture Management
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DensDeck Roof Board is an exceptional fire barrier, DensDeck Roof Boards, like other components
thermal barrier, coverboard and recovery board used used in roofing systems, must be protected from
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in various Duro-Last roofing systems. The exposure to moisture before, during and after
DensDeck Roof Board design employs fiberglass installation.
mats, front and back, that are mechanically bonded to
a high density gypsum core, providing excellent fire Remove the plastic packaging from all DensDeck
resistance and wind uplift properties. The unique Roof Board immediately upon receipt of delivery.
construction of DensDeck Roof Board provides Failure to remove the plastic packaging may result in
superior flute spanning that stiffens and provides entrapment of condensation or moisture. DensDeck
increased foot traffic resistance to the roof deck. Roof Board stored outside must be stored level and
Additionally, DensDeck Roof Board has been shown off the ground and protected by a breathable
to withstand delamination, deterioration and job-site waterproof covering. Provide means for air circulation
damage far more effectively than roofing membrane around and under stored bundles of DensDeck Roof
substrates such as paperfaced gypsum board, Board. DensDeck Roof Board must be covered the
fiberboard and perlite insulation. DensDeck Roof same day as installed.
Board has scored a 10, the highest level of
performance for mold resistance per the ASTM Avoid application of DensDeck Roof Boards during
D3273 test method. rain, heavy fog and any other conditions that may
deposit moisture on the surface, and avoid the
Primary Uses overuse of non-vented, direct-fired heaters during
DensDeck Roof Board can be used as a substrate winter months. When roofing systems are installed on
board, recovery board and overlayment protection newly poured concrete or light weight concrete decks
board for polyisocyanurate and polystyrene or when re-roofing over an existing concrete deck, a
insulation. vapor barrier should be installed above the concrete
to limit the migration of water from the concrete into
Standards and Code Approvals the roof assembly. Always consult a design authority
DensDeck Roof Boards are manufactured to meet for specific instructions for applying other products to
ASTM C1177 and have the following approvals: DensDeck Roof Boards.
• Florida Product Approved
• Miami-Dade County, Product Control Approved Moisture vapor movement by convection must be
eliminated, and the flow of water by gravity through
Recommendations and Limitations imperfections in the roof system must be controlled.
DensDeck Roof Boards are manufactured to act with After a leak has occurred, no condensation on the
a properly designed roof system following good upper surface of the system should be tolerated, and
roofing practices. The actual use of DensDeck Roof the water introduced by the leak must be dissipated
Board as a roofing component in any system or to the building interior in a minimum amount of time.
assembly is the responsibility of the roofing system’s
design authority. Consult with the appropriate design Although DensDeck Roof Boards are engineered with
authority for system and assembly specifications and fiberglass facings and high density gypsum cores, the
instructions on applying other products to DensDeck presence of free moisture can have a detrimental
Roof Board. effect on the performance of the product. Moisture
accumulation may also significantly decrease wind
DensDeck Roof Boards should not be subjected to uplift and vertical pull resistance in the system or
abnormal or excessive loads or foot traffic, such as, assembly. DensDeck Roof Boards containing
but not limited to, use on plaza decks or under steel- excessive free moisture content may need to be
wheeled equipment that may fracture or damage the evaluated for structural stability to assure wind uplift
panels. Provide suitable roofing system protection performance.
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