Duro-Last EPS Types II and VIII - Manual (Page 2)

Duro-Last, “World’s Best Roof” and Duro-Guard are registered marks owned by Duro-Last, Inc.
Updated: 11/4/2013
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DURO-GUARD ® EPS TYPES II AND VIII
Installation:
• Duro-Guard EPS panels and Duro-Last
membrane must never be in direct contact.
Refer to the appropriate Duro-Last specification
for slip sheet and cover board requirements.
• Panels must be kept dry before, during and
after installation. Install only as much insulation
as can be covered the same day with
completed roofing.
• The use of multiple layers of insulation with
joints staggered a minimum of 6 inches
between layers is recommended to eliminate
thermal bridging.
• Butt panel edges together and stagger joints of
adjacent panels.
• Boards must be neatly fitted to roof deck and
around penetrations with no gaps greater than
¼ inch.
• Refer to the appropriate Duro-Last roof system
specification and detail drawings for deck
preparation and attachment requirements.
• Precautions must be taken to ensure that new
concrete decks have fully hydrated and do not
continue to release moisture.
Panel Attachment:
• Panels may be attached to the roof deck using
mechanical fasteners or insulation adhesive. It
is acceptable to use these products in
combination.
Mechanical Attachment
• When installing multiple layers (which may
include insulation, cover boards and thermal
barriers) it is acceptable to mechanically secure
through all layers.
• Use fasteners and plates supplied by or
approved by Duro-Last, Inc.
Adhesive Attachment
o
Insulation adhesive must be supplied by
Duro-Last, Inc. Refer to the adhesive’s
product data sheet for application guidelines.
Acceptable products:
o
Duro-Grip ® Insta-Stik™.
o
Duro-Grip ® Olybond ® .
o
Duro-Grip ® Millenium Weather-Tite ® .
o
Duro-Grip ® CR-20.
• Subsequent layers of insulation and approved
cover boards may also be attached with
insulation adhesive.
• Maximum panel dimensions are 4ft. x 4ft.
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.
TABLE 2. TYPICAL THERMAL VALUES
THICKNESS* R-Value
inches mm TYPE II TYPE VIII
1.00 25 4.5 4.2
1.50 38 6.7 6.3
2.00 51 9.0 8.4
2.50 64 11.2 10.5
3.00 76 13.5 12.6
3.50 89 15.7 14.7
4.00 102 17.0 16.8
4.50 114 20.2 18.9
5.00 127 22.5 21
5.50 140 24.7 23.1
6.00 152 27.0 25.2
* Contact Duro-Last for additional thickness options.
TABLE 3. TYPICAL PHYSICAL PROPERTIES
Property Test Method Type II
Type
VIII
Density
(nominal)
ASTM C 303 1.50 pcf 1.25 pcf
R-Value
(per inch)
@25°F
@40°F
@75°F
ASTM C 518
or
C 177
4.76
4.55
4.17
4.55
4.25
3.92
Compressive
Strength
(10% deformation)
ASTM
D 1621
15 – 21
psi
13 – 18
psi
Flexural Strength ASTM C 203 ≥ 35 psi ≥ 30 psi
Dimensional
Stability
ASTM
D 2126
≤ 2.0%
Water Vapor
Permeance
ASTM E 96 ≤ 3.5 perm
Water Absorption ASTM C 272 ≤ 3.0%
Flame Spread ASTM E 84 20
Smoke Developed ASTM E 84 150 - 300
• Store elevated (at least 3”) and completely
covered with a weatherproof covering such as
a tarpaulin.
• Do not use panels which are wet or damaged.
Limitations:
• Duro-Last, Inc. will not be responsible or liable
for any defects or problems related to building
or roof design by others, to deficiencies in
construction, to dangerous conditions on the
job site, or to improper storage, handling or
installation by others.