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®
DURO-GUARD ISO IV

Panel Attachment: TABLE 1. THERMAL VALUES
 Panels may be attached to the roof deck using THICKNESS* LTTR FLUTE SPANABILITY
mechanical fasteners, insulation adhesive or inches mm R-VALUE inches mm
hot bitumen. It is acceptable to use these 1.00 25 5.70 2.625 67
products in combination. 1.50 38 8.60 4.375 111
1.60 41 9.10 4.375 111
Mechanical Attachment 1.70 43 9.70 4.375 111
2.00 51 11.40 4.375 111
 When installing multiple layers (which may 2.50 64 14.40 4.375 111
include insulation, cover boards and thermal 2.70 69 15.60 4.375 111
barriers) it is acceptable to mechanically secure 3.00 76 17.40 4.375 111
through all layers. 3.30 84 19.20 4.375 111
3.50 89 20.50 4.375 111
 Use fasteners and plates supplied by or 3.60 91 21.10 4.375 111
approved by Duro-Last, Inc. 4.00 102 23.60 4.375 111
* Contact Duro-Last for additional thickness options.
Adhesive Attachment
 Insulation adhesive must be supplied by Duro-
Last, Inc. Refer to the adhesive’s product data TABLE 2. TYPICAL PHYSICAL PROPERTIES
sheet for application guidelines. Acceptable Grade 2 20 psi
products: Compressive ASTM D 1621 (138 kPa)
®
o Duro-Grip Insta-Stik™. Strength ASTM C 1289 Grade 3 25 psi
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o Duro-Grip Olybond . (172 kPa)
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o Duro-Grip Millenium Weather-Tite . Dimensional ASTM D 2126 2% linear change
Stability
(7 days)
o Duro-Grip CR-20.
Moisture Vapor < 4 perm
2
 Subsequent layers of insulation and approved Transmission ASTM E 96 (85.0 ng/Pa·s·m )
cover boards may be attached with insulation Water
adhesive. Absorption ASTM C 209 < 1.5% volume
 Maximum panel dimensions are 4 ft. x 4 ft. Service -40° to 200° F
Temperature (-40° to 93° C)
Hot Bitumen Attachment

 When using hot bitumen on concrete decks,
priming is necessary.  Do not use panels which are wet or damaged.
 Temperature of the bitumen shall be  Refer to PIMA Technical Bulletin No. 109:
approximately 50° F below the inter-ply hand Storage and Handling Recommendations for
mopping EVT. Polyiso Roof Insulation for additional guidelines
(www.pima.org).
 The deck shall be dry and care must be taken
to apply the bitumen in sufficient quantity to
totally cover the available deck surface. Limitations:
 To ensure embedment, the board shall also be  Duro-Last, Inc. will not be responsible or liable
“stepped in” at several points while the bitumen for any defects or problems related to building
is still hot enough to allow positive attachment. or roof design by others, to deficiencies in
construction, to dangerous conditions on the
 Maximum panel dimensions are 4 ft. x 4 ft.
job site, or to improper storage, handling or
 Any roof membrane contaminated with bitumen installation by others.
must be replaced.

Storage:

 Insulation must be protected from open flame
and kept dry at all times.
 Factory applied packaging is intended only for
protection during transit. Slit or remove the
packaging to prevent accumulation of
condensation.
 Store elevated (at least 3 inches) and
completely covered with a weatherproof
covering such as a tarpaulin.

www.duro-last.com 2 of 2 800-248-0280
Duro-Last, Duro-Bond, Duro-Grip, “World’s Best Roof” and Duro-Guard are registered marks owned by Duro-Last, Inc.
Weather-Tite is a registered mark owned by Millenium Adhesive Company. RoofNav is a registered mark owned by FM Global. Olybond500 is a registered mark owned by OMG, Inc.
Created: 01/17/2012 Revised: 03/09/2012, 03/19/2013, 10/31/3013, 05/08/2015, 07/27/2016