Dens-Deck® Roof Board
G-P Gypsum Corporation
Dens-Deck® roof board is an exceptional fire barrier, thermal barrier and recovery board used in various commercial roofing systems. The patented Dens-Deck® 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 Dens-Deck® provides superior flute spanning that stiffens and provides increased foot traffic resistance to the roof deck. Additionally, Dens-Deck® has been shown to withstand delamination, deterioration, warping and job-site damage more effectively than other roofing membrane substrates such as paper-faced gypsum board, fiberboard and perlite insulation.
Roof system manufacturers and designers have found Dens-Deck® roof
board to be compatible with many types of roofing systems, including: built-up,
modified bitumen, single ply, metal systems, wood shingle and shake, tile, slate,
recover board, as well as an overlayment protection board for polyisocyanurate and
polystyrene insulation. Dens-Deck® 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" Dens-Deck® may also be
used in vertical applications as a backer board or liner for the roof side of parapet
Dens-Deck® is designed to act with a properly designed roof system.
The actual use of Dens-Deck® roof board as a roofing component is
the responsibility of the roofing system’s designing authority.
Hot Mopping over Dens-Deck®:
Torch applied directly to Dens-Deck®:
Refer to the installation instruction for the specific roof system to be installed for additional requirements.
Flame spread 0, smoke developed 0, when tested in accordance with ASTM E84 or CAN/ULC-S102.
Noncombustible when tested in accordance with ASTM E136.
1 Tested in accordance with ASTM E661 (400 lb. conc. load)
All documents are U.S. English unless otherwise noted