Materials:DensDeck Roofboard

Notice to the Reader: The roofing assembly / material information published in the RCABC Roofing Practices Manual and offered below does NOT represent a complete set of the manufacturer’s data or specifications. The preparation of a detailed specification is the responsibility of the design authority.

Manufacturer: Georgia-Pacific Canada Ltd. Accepted for RoofStar Guarantee Program Date TBA Product Summary DensDeck Roof Guard is a water-resistant treated gypsum board manufactured with an embedded non structural fibreglass mat facer and a water-resistant treated core. DensDeck Prime Roof Guard is identical except that it has a treated surface to improve bonding. DensDeck Roof Guard is an accepted insulation overlay board in the RoofStar Guarantee Program. DensDeck Prime Roof Guard is an accepted insulation overlay board for adhered roof assemblies in the RoofStar Guarantee Program. DensDeck Roof Guard and DensDeck Prime Roof Guard have achieved a very comprehensive Class A (UL 790) fire rating at Underwriters Laboratories due to their outstanding fire resistance. ASTM E 84 with DensDeck Roof Guard and DensDeck Prime Roof Guard: Flame Spread 0, Smoke Developed 0 ASTM E 119 with 5/8" DensDeck Fireguard Type X Roof Guard: UL Classified Type DGG DensDeck Roof Guard ® and DensDeck Prime Roof Guard™ Properties, Standards and Classifications ¼" DensDeck Roof Guard ¼" DensDeck Prime Roof Guard ½" DensDeck Roof Guard ½" DensDeck Prime Roof Guard 5⁄8" DensDeck Roof Guard 5⁄8" DensDeck Prime Roof Guard Thickness, inches, nominal ¼" ± 1/16" ¼" ± 1/16" ½" ± 1/32" ½" ± 1/32" 5⁄8" ± 1/32" 5⁄8" ± 1/32" Width, standard 4' ± 1⁄8" 4' ± 1⁄8" 4' ± 1⁄8" 4' ± 1⁄8" 4' ± 1⁄8" 4' ± 1⁄8" Length, standard 8' ± ¼" 8' ± ¼" 8' ± ¼" 8' ± ¼" 8' ± ¼" 8' ± ¼" Weight, lb / sq. ft., nominal 1.1 1.15 1.95 1.975 2.5 2.55 Surfacing Glass mat Glass mat with non-asphaltic coating Glass mat Glass mat with non-asphaltic coating Glass mat Glass mat with non-asphaltic coating Flexural Strength 4, parallel, lb. min 405 405 805 805 1005 1005 Flute Spanability1 25⁄8" 25⁄8" 5" 5" 8" 8" Permeance2 , Perms 50 50 35 35 32 32 “R” Value3 .28 .28 .56 .56 .67 .67 Linear Variation with change in temp., in / in  °F 8.5 x 10-6 8.5 x 10-6 8.5 x 10-6 8.5 x 10-6 8.5 x 10-6 8.5 x 10-6 Linear Variation with change in Moisture, in / in %RH 6.25 x 10-6 6.25 x 10-6 6.25 x 10-6 6.25 x 10-6 6.25 x 10-6 6.25 x 10-6 Water Absorption 4, % max 10.0 10.0 10.0 10.0 10.0 10.0 Compression Strength, psi nominal 500 - 900 500 - 900 500 - 900 500 - 900 500 - 900 500 - 900 Surface water Absorption4, Grams, nominal 2.5 <2.0 2.5 <2.0 2.5 <2.0 Flame Spread, Smoke Developed (ASTM E 84) 0 0 0 0 0 0 Fire Classification FMRC Class 1 (as overlayment) UL Class A (UL 790) ULC S-102 FMRC Class 1 (FM 4450) UL 1256, ULC S-126 UL Class A (UL 790) ULC S-102 FMRC Class 1 (FM 4450) UL 1256, ULC S-126 UL Classified “P” assemblies ULC Classified “R” assemblies ULC S-1-1 Class A (UL 790), ULC S-107 Mold and Mildew Resistance No growth7 No growth7 No growth7 FM Approvals6 60 and 90 psf uplift / FM Class 1-90 as an overlayment FMRC 1-60, 1-90, 1-135 FMRC 1-60, 1-90, 1-180 Bending Radius 5’ 8’ 12’ Tested in accordance with ASTM E-661 (400 lb. conc. load only for 1⁄2" and 5⁄8"). Tested in accordance with ASTM E-96 (dry cup method). Tested in accordance with ASTM C 518 (heat flow meter). Tested in accordance with ASTM C 473. ASTM C 1177 minimums. Higher wind uplift ratings have been achieved by numerous membrane manufacturers using DensDeck Roof Guard in their FMRC-approved construction designs. Tested in accordance with ASTM D 3273. Due to the outstanding fire performance of 5/8" DensDeck Fireguard Type X Roof Guard, this product can replace any generic Type X gypsum board in an assembly in the UL Fire Resistance Directory under the prefix “P”. 5/8" DensDeck Fireguard Type X Roof Guard is classified by Underwriters Laboratories and can be used in the following UL “P” assemblies: P225, P227, P230, P232, P235, P254, P257, P259, P266, P508, P510, P512, P514, P518, P701, P713, P714, P717, P718, P719, P720, P722, P724, P725, P726, P727, P728, P729, P730, P731, P732, P733, P734, P735, P736, P738, P739, P740, P801, P803, P805, P811, P813, P814, P815, P818, P819, P824, P825, P826, P828, P921 UL of Canada R210, R217, R222, R223, R224, R702, R703, R705, R804, R806, R808 ANSI / UL 1256 Steiner Tunnel “Fire Classified Construction”. This listing allows direct application on steel decking with ¼", ½" or 5/8" DensDeck or DensDeck Prime Roof Guard under foamed plastic insulations.

Click below for the Technical Data Sheet (TBA).

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