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®
DURO-GUARD ISO III CG
Installation:
TABLE 2. THERMAL VALUES
 Panels must be kept dry before, during and
after installation. Install only as much insulation THICKNESS* LTTR FLUTE SPANABILITY
as can be covered the same day with inches mm R-VALUE inches mm
5.70
25
2.625
1.00
67
completed roofing. 1.50 38 8.60 4.375 111
 The use of multiple layers of insulation with 1.60 41 9.10 4.375 111
9.70
joints staggered a minimum of 6 inches 1.70 43 11.40 4.375 111
4.375
2.00
51
111
between layers is recommended to eliminate 2.50 64 14.40 4.375 111
thermal bridging. 2.70 69 15.60 4.375 111
3.00 76 17.40 4.375 111
 Butt panel edges together and stagger joints of
adjacent panels. 3.30 84 19.20 4.375 111
89
3.50
111
4.375
20.50
 Boards must be neatly fitted to roof deck and 3.60 91 21.10 4.375 111
around penetrations with no gaps greater than 4.00 102 23.60 4.375 111
¼ inch. * Contact Duro-Last for additional thickness options.

 Refer to the appropriate Duro-Last roof system TABLE 3. TYPICAL PHYSICAL PROPERTIES
specification and detail drawings for deck 20 psi
preparation and attachment requirements. Compressive ASTM D 1621 Grade 2 (138 kPa)
 Precautions must be taken to ensure that new Strength ASTM C 1289 Grade 3 25 psi
concrete decks have fully hydrated and do not (172 kPa)
continue to release moisture. Dimensional ASTM D 2126 2% linear change
Stability
(7 days)
Panel Attachment: Moisture Vapor ASTM E 96 < 1 perm
2
Transmission (85.0 ng/Pa·s·m )
 Panels may be attached to the roof deck using Water
mechanical fasteners, insulation adhesive or Absorption ASTM C 209 < 1% volume
hot bitumen. It is acceptable to use these Service -40° to 200° F
products in combination. Temperature (-40° to 93° C)
Mechanical Attachment  To ensure embedment, the board shall also be
 When installing multiple layers (which may “stepped in” at several points while the bitumen
include insulation, cover boards and thermal is still hot enough to allow positive attachment.
barriers) it is acceptable to mechanically secure  Maximum panel dimensions are 4 ft. x 4 ft.
through all layers.
 Any roof membrane contaminated with bitumen
 Use fasteners and plates supplied by or must be replaced.
approved by Duro-Last, Inc.
Adhesive Attachment Storage:
 Insulation adhesive must be supplied by Duro-  Insulation must be protected from open flame
Last, Inc. Refer to the adhesive’s product data and kept dry at all times.
sheet for application guidelines. Acceptable  Factory applied packaging is intended only for
products: protection during transit. Slit or remove the
®
™
o Duro-Grip Insta-Stik . packaging to prevent accumulation of
®
o Duro-Grip Olybond . condensation.
®
o Duro-Grip Millenium Weather-Tite .  Store elevated (at least 3 inch) and completely
o Duro-Grip CR-20. covered with a weatherproof covering such as
a tarpaulin.
 Subsequent layers of insulation and approved
cover boards may be attached with insulation  Do not use panels which are wet or damaged.
adhesive.  Refer to PIMA Technical Bulletin No. 109:
 Maximum panel dimensions are 4 ft. x 4 ft. Storage and Handling Recommendations for
Polyiso Roof Insulation for additional guidelines
Hot Bitumen Attachment (www.pima.org).
 When using hot bitumen on concrete decks,
priming is necessary. Limitations:
 Temperature of the bitumen shall be  Duro-Last, Inc. will not be responsible or liable
approximately 50° F below the inter-ply hand for any defects or problems related to building
mopping EVT. or roof design by others, to deficiencies in
 The deck shall be dry and care must be taken construction, to dangerous conditions on the
to apply the bitumen in sufficient quantity to job site, or to improper storage, handling or
totally cover the available deck surface. installation by others.

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Duro-Last, “World’s Best Roof”, Duro-Bond, Duro-Grip and Duro-Guard are registered marks owned by Duro-Last, Inc.
Updated: 10/30/2013, 03/31/2014, 07/27/2016