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®
                                   DURO-GUARD  DENSDECK                                 ®

                                        5/8-INCH ROOF BOARD


            Description                                          Moisture Management
                     ®
            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
                              ®
            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
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