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DURO-GUARD DEXCELL GLASS MAT
5/8-INCH ROOF BOARD

Description:
™
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Duro-Guard DEXcell Glass Mat Roof Board is a
high-performance roof board for use in low-slope
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Duro-Last roofing systems. It enhances the durability
of the roofing system when used as a cover board in
mechanically attached systems. The specially treated
core and high-performance glass mat facer provide
protection against fire, mold and moisture.

 Manufactured to ASTM C 1177.

 Fire barrier meets FM Class 1 and UL Class A
fire ratings for roofing systems up to unlimited
slope per UL 790. Flat Panels:

 Resists mold growth on the board per ASTM D  Available sizes:
3273. o 4 ft. x 8 ft.
 Scores and snaps easily. o 4 ft. x 4 ft.

 Coated fiberglass facers for improved handling o Thickness: 5/8 inch.
and strength.

 High density.

 Refer to Table 1 for physical properties.
TABLE 1. PHYSICAL PROPERTIES
Recommended Uses: Flexural Strength, ASTM C 473
Parallel Method B 100 lbs. min.
 Mechanically attached Duro-Last roofing
systems. Flute Spanability ASTM E 661 8 inches
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 Duro-Bond roofing systems. Permeance ASTM E 96 23 perms
 Metal retrofit roofing systems.
Water Absorption ASTM C 1177 10% max.
Underwriters Laboratories, Inc. Classifications:
Mold Resistance ASTM D 3273 10
 Refer to Duro-Last’s UL Listings
(TGFU.R10128) for assembly details. Compressive ASTM C 473 900 psi
Strength
Factory Mutual Approvals: Flame Spread, ASTM E 84, UL
Smoke Developed 723, CAN/ULC- 0/0
 FM 4450, FM 4470. S102
 FM Class 1. Bending Radius 8 ft.
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 Refer to FM Approval’s RoofNav for details on Weight 2.5 lbs./sq. ft.
FM Approved systems (www.roofnav.com).

www.duro-last.com 1 of 2 800-248-0280
Duro-Last, Duro-Guard, Duro-Bond and “World’s Best Roof” are registered marks owned by Duro-Last, Inc.
RoofNav is a registered trademark owned by FM Global.
Created: 01/18/2016