Why DensDeck® Roof Board?
The patented DensDeck® design employs glass mat facings front and back that are embedded into a water-resistant gypsum core providing excellent fire resistance, moisture resistance, and wind uplift properties. The unique construction of DensDeck® provides excellent flute spanning that stiffens and provides increased foot traffic resistance to the roof deck.
Additionally, DensDeck® has been shown to withstand delamination, deterioration, warping, and jobsite damage more effectively than other roofing membrane substrates such as paper-faced gypsum board, fiber board, and perlite insulation.
DensDeck® Roof Board is compatible with many types of roofing systems, including:
- Modified bitumen
- Single ply
- Metal systems
- Wood shingle
- Re-cover board
It can also be used as an overlayment protection board for polyisocyanurate and polystyrene insulation. DensDeck® Roof Boards can also be used as a form board for poured gypsum concrete deck in roof applications as well as a substrate for spray foam roofing systems. 1/2" and 5/8" DensDeck® Roof Boards may also be used in vertical applications as a backer board or liner for the roof side of parapet walls.
Some membrane manufacturers have hot-mopped asphalt or torch applications directly to DensDeck® without using a primer or base sheet. Refer to specific membrane system application instructions. System manufacturers and designers have found Dens Deck® Roof Boards to be compatible with bonding adhesives for fully-adhered single-ply membrane applications.
DensDeck® Roof Board's exceptional moisture resistance and low R-value make it the preferred substrate for vapor retarders.
An excellent fire barrier, DensDeck® Roof Boards feature a noncombustible core and inorganic surface that offer greater fire protection than other conventional commercial roofing products when applied over combustible roof decks and steel decks. DensDeck® Roof Boards are FM tested and approved as the only 1/2" gypsum product to meet the calorimeter requirements for conventionally insulated decks. Tested in accordance with ASTM E84, its surface burning characteristics are Flame Spread-0 and Smoke Developed-0. 5/8" DensDeck® Roof Boards can replace any generic type X gypsum board in any roof assembly in the UL Fire Resistance Directory under the prefix.
G-P Gypsum Corporation
133 Peachtree Street, N.E.
Atlanta, GA 30303
Technical 1-800-225-6119 (8-7 ET)