DensDeck®

Roof Board

Roof Board

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.

Uses

DensDeck® Roof Board is compatible with many types of roofing systems, including:

  • Built-up
  • Modified bitumen
  • Single ply
  • Metal systems
  • Wood shingle
  • Shake
  • Tile
  • Slate
  • 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.

 

Manufacturer:

G-P Gypsum Corporation

133 Peachtree Street, N.E.

Atlanta, GA 30303

Technical 1-800-225-6119 (8-7 ET)

Available Sizes

Note:  Product sizes, dimensions, and widths are nominal values and are subject to normal manufacturing/packaging tolerance and variation.
  • R-Values
    .28
  • Spannings
    1/4" - spans flute widths up to 2 5/8"
  • Flexural Strengths, Parallel, lbs. min.
    >= 40 (178)
  • Weights, nom. lbs. / M sq. ft.
    1100 lb.
  • Lengths
    8' ±1/4"
  • Thicknesses
    1/4" (6.4 mm)
  • Weights, nom. lbs. / sq. ft.
    1.2 lb. (5.9 sq. ft.)
  • Permeance Perms
    >50 (>2850)
  • Flute Spanabilities
    2-5/8"
  • R-Values
    .56
  • Spannings
    1/2" - spans flute widths up to 5"
  • Flexural Strengths, Parallel, lbs. min.
    >=80 (356)
  • Weights, nom. lbs. / M sq. ft.
    1950 lb.
  • Lengths
    8' ±1/4"
  • Thicknesses
    1/2" (12.7 mm)
  • Weights, nom. lbs. / sq. ft.
    2.0 lb. (9.8 sq. ft.)
  • Permeance Perms
    >35(>1995)
  • Flute Spanabilities
    5"
  • R-Values
    .67
  • Spannings
    5/8" - spans flutes up to 8" wide
  • Flexural Strengths, Parallel, lbs. min.
    >=100 (400)
  • Weights, nom. lbs. / M sq. ft.
    2500 lb.
  • Lengths
    8' ±1/4"
  • Thicknesses
    5/8" (15.9 mm) Fireguard Type X
  • Weights, nom. lbs. / sq. ft.
    2.5 lb. (12.2 sq. ft.)
  • Permeance Perms
    >32(>1824)
  • Flute Spanabilities
    8"

Product Properties

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