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®
DURO-GUARD ISO HD

Description:
®
Duro-Guard ISO HD is a ½ inch thick high density
polyisocyanurate insulation panel specifically
designed for use as a cover/recover board. It is
manufactured on-line using premium performance
coated glass facers.
 R-value of 2.5 is significantly higher than roof
cover boards made of wood fiber or gypsum.
 Lightweight (11 lbs. per 4 ft. x 8 ft. panel).
 Easy to cut, handle and install.
 Manufactured with a blowing agent that has
zero ozone depletion potential (ODP) and Figure 1. Duro-Guard ISO HD (Shown as Recover Board)
virtually no global warming potential (GWP).
 Recycled content > 8%.
 Compressive Strength > 90 psi. TABLE 1. PHYSICAL PROPERTIES – COVER BOARD
Compressive
 4 pcf density provides enhanced physical Strength ASTM D 1621 > 90 PSI
properties. Dimensional < .5 % linear change
 Passes ASTM Resistance to Mold Test. Stability ASTM D 2126 (7 days)
Water
 Refer to Table 1 for physical properties. Absorption ASTM C 209 < 1% volume
Resistance to ASTM D 3273 Passed
Recommended Uses: Mold
Service
®
 Mechanically attached Duro-Last roof Temperature 260° F (126° C) or less
systems.
Installation:
 Adhered/Fully Bonded Duro-Last roof systems.
®
 Duro-Bond roof systems.  In steel deck applications, Duro-Guard ISO HD
can only be used as a cover board over
 Metal retrofit roof systems. insulation or as recover board over an existing
roof. It may be placed directly on flute filler in a
Underwriters Laboratories, Inc. Classifications: metal roof retrofit application assuming the
 Refer to Duro-Last’s UL Listings flutes are completely filled.
(TGFU.R10128) for assembly details.  Panels must be kept dry before, during and
after installation. Install only as much insulation
Factory Mutual Approvals: as can be covered the same day with
completed roofing.
 FM 4450, FM 4470.
 The use of multiple layers of insulation with
 Refer to FM Approval’s RoofNav for details on joints staggered a minimum of 6 inches
FM Approved systems (www.roofnav.com).
between layers is recommended to eliminate
thermal bridging.
Flat Panels:
 Abut panel edges together and stagger joints of
 Available size: adjacent panels.
o 4 ft. x 8 ft.  Boards must be neatly fitted to roof deck and
o 4 ft. x 4 ft. around penetrations with no gaps greater than
o Thicknesses: ½ inch. ¼ inch.
 Refer to the appropriate Duro-Last roof system
specification and detail drawings for deck
preparation and attachment requirements.

www.duro-last.com 1 of 2 800-248-0280

Duro-Last, “World’s Best Roof” and Duro-Guard are registered marks owned by Duro-Last, Inc.
Updated: 10/31/2013