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®
DURO-GUARD ISO II
Installation:
TABLE 2. THERMAL VALUES
 Panels must be kept dry before, during and THICKNESS* FLUTE SPANABILITY
LTTR
after installation. Install only as much insulation inches mm R-VALUE inches mm
as can be covered the same day with 1.00 25 5.70 2.625 67
completed roofing. 1.50 38 8.60 4.375 111
1.60 41 9.10 4.375 111
 The use of multiple layers of insulation with 1.70 43 9.70 4.375 111
joints staggered a minimum of 6 inches 2.00 51 11.40 4.375 111
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
 Abut panel edges together and stagger joints of 3.30 84 19.20 4.375 111
adjacent panels. 3.50 89 20.50 4.375 111
 Boards must be neatly fitted to roof deck and 3.60 91 21.10 4.375 111
4.00
102
23.60
4.375
around penetrations with no gaps greater than * Contact Duro-Last for additional thickness options. 111
¼ inch.
 Refer to the appropriate Duro-Last roof system TABLE 3. TYPICAL PHYSICAL PROPERTIES
specification and detail drawings for deck Grade 2 20 psi
preparation and attachment requirements. Compressive ASTM D 1621 (138 kPa)
Strength ASTM C 1289 25 psi
 Precautions must be taken to ensure that new Grade 3 (172 kPa)
concrete decks have fully hydrated and do not Dimensional ASTM D 2126 2% linear change
continue to release moisture. Stability (7 days)
Moisture Vapor < 1 perm
Panel Attachment: Transmission ASTM E 96 (85.0 ng/Pa·s·m )
2
Water
 Panels may be attached to the roof deck using Absorption ASTM C 209 < 1% volume
mechanical fasteners, insulation adhesive or Service -40° to 200° F
hot bitumen. It is acceptable to use these Temperature (-40° to 93° C)
products in combination.
totally cover the available deck surface.
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
through all layers.  Maximum panel dimensions are 4 ft. x 4 ft.
 Any roof membrane contaminated with bitumen
 Use fasteners and plates supplied by or must be replaced.
approved by Duro-Last, Inc.
Storage:
Adhesive Attachment
 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 inches) and
completely covered with a weatherproof
o Duro-Grip CR-20. covering such as a tarpaulin.
 Subsequent layers of insulation and approved  Do not use panels which are wet or damaged.
cover boards may be attached with insulation
adhesive.  Refer to PIMA Technical Bulletin No. 109:
Storage and Handling Recommendations for
 Maximum panel dimensions are 4 ft. x 4 ft.
Polyiso Roof Insulation for additional guidelines
Hot Bitumen Attachment (www.pima.org).
 When using hot bitumen on concrete decks, Limitations:
priming is necessary.
 Duro-Last, Inc. will not be responsible or liable
 Temperature of the bitumen shall be for any defects or problems related to building
approximately 50° F below the inter-ply hand or roof design by others, to deficiencies in
mopping EVT. construction, to dangerous conditions on the
 The deck shall be dry and care must be taken job site, or to improper storage, handling or
to apply the bitumen in sufficient quantity to installation by others.
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Duro-Last, “World’s Best Roof” and Duro-Guard are registered marks owned by Duro-Last, Inc.
Updated: 10/31/2013, 07/27/2016