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DURO-GUARD DENSDECK PRIME 5/8-INCH ROOF BOARD
Fire Resistance Classifications Physical Properties
DensDeck Prime Roof Boards are excellent fire Properties 5/8” (15.9 mm)
barriers over combustible and noncombustible roof
decks, including steel decks. Thickness, nominal 5/8” (15.9 mm) ± 1/32” (.8 mm)
Width, standard 4’ (1219 mm) ± 1/8” (3 mm)
UL 790 Classification. DensDeck Prime Roof Boards Length, standard 4’ (1219 mm) and 8’ (2438
have been classified by Underwriters Laboratories mm) ± 1/4” (6.4 mm)
(UL) for use as a fire barrier over combustible and Weight, nominal, lbs./sq. ft. 2.5 (12.2)
2
(Kg/m )
noncombustible decks in accordance with the Fiberglass mat with non-
ANSI/UL 790 test standard. The UL classification Surfacing asphaltic coating
1
includes a comprehensive Class A, B or C rating. For Flexural Strength , parallel, lbf. ≥100 (444)
additional information concerning the UL 790 min. 2
classification, consult the UL Certification Directory. Flute Spanability 8” (203 mm)
3
Permeance , Perms >17 (970)
UL 1256 Classification. DensDeck Prime Roof Boards R Value , ft •°F•hr/BTU (m •K/W) .67
4
2
2
have also been classified by UL in roof deck Linear Variation with Change in -6 -6
constructions for internal (under deck) fire exposure Temp., in/in °F (mm/mm/C°) 8.5 x 10 (15.3 x 10 )
in accordance with the ANSI/UL 1256 Steiner Tunnel Linear Variation with Change in 6.25 x 10
-6
test. For additional information concerning the UL Moisture
5
1256 classification, consult the UL Certification Water Absorption , % max <10
6
Directory. Compressive Strength , psi 900
nominal
FM Class 1 Approvals. DensDeck Prime Roof Boards Surface Water Absorption, grams, <2.0
nominal
are included in numerous roofing assemblies with a Flame Spread, Smoke Developed
Factory Mutual (FM) Class 1 fire rating. For more (ASTM E84) 0/0
information concerning FM Approvals and FM Class 1 Bending Radius 8’ (2438 mm)
assemblies with DensDeck Roof Boards, consult FM 1. Tested in accordance with ASTM C473 method B.
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or RoofNav . 2. Tested in accordance with ASTM E661.
3. Tested in accordance with ASTM E96 (dry cup method).
UL Fire Resistance Ratings. For information 4. Tested in accordance with ASTM C518 (heat flow meter).
5. Tested in accordance with ASTM C1177.
concerning UL fire rated assemblies, please visit 6. Tested in accordance with ASTM C473.
www.ul.com.

Flame Spread and Smoke Developed. When tested
in accordance with ASTM E84, DensDeck Prime Roof FIRE SAFETY CAUTION
Boards had Flame Spread 0, Smoke Developed 0. Passing a fire test in a controlled laboratory setting
and/or certifying or labeling a product as having a
Wind Uplift one-hour, two-hour, or any other fire resistance or
DensDeck Roof Boards are included in numerous protection rating and, therefore, as acceptable for use
assemblies evaluated by FM or other independent in certain fire rated assemblies/systems, does not
laboratories for wind uplift performance. For mean that either a particular assembly/system
information concerning such assemblies, please visit incorporating the product, or any given piece of the
www.roofnav.com. product itself, will necessarily provide one-hour fire
resistance, two-hour fire resistance, or any other
Handling and Use–CAUTION specified fire resistance or protection in an actual fire.
This product contains fiberglass facings which may In the event of an actual fire, you should immediately
cause skin irritation. Dust and fibers produced during take any and all actions necessary for your safety and
the handling and installation of the product may the safety of others without regard for any fire rating
cause skin, eye and respiratory tract irritation. Avoid of any product or assembly/system.
breathing dust and minimize contact with skin and
eyes. Wear long sleeve shirts, long pants and eye
protection. Always maintain adequate ventilation. Use
a dust mask or NIOSH/MSHA approved respirator as
appropriate in dusty or poorly ventilated areas.

www.duro-last.com 2 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