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DURO-GUARD EPS NAIL BASE
• Subsequent layers of insulation and approved
Installation: cover boards may also be attached with
• Duro-Guard EPS Nail Base may be used insulation adhesive.
directly under the Duro-Last membrane. • Maximum panel dimensions are 4ft. x 4ft.
Care should be taken to ensure that “bare”
EPS is never in direct contact with the
membrane. Refer to the appropriate Duro-
Last specification for slip sheet and cover TABLE 2. TYPICAL PHYSICAL PROPERTIES (FOAM CORE)
board requirements. Property Test Type II Type VIII
• Panels must be kept dry before, during and Method
after installation. Install only as much insulation Density ASTM 1.50 pcf 1.25 pcf
as can be covered the same day with (nominal) C 303
completed roofing. R-Value ASTM
(per inch)
• The use of multiple layers of insulation with @25°F C 518 4.76 4.55
joints staggered a minimum of 6 inches @40°F or 4.55 4.25
between layers is recommended to eliminate @75°F C 177 4.17 3.92
thermal bridging.
Compressive
• Butt panel edges together and stagger joints of Strength ASTM 15 – 21 13 – 18
adjacent panels. (10% deformation) D 1621 psi psi
• Boards must be neatly fitted to roof deck and ASTM
around penetrations with no gaps greater than Flexural Strength C 203 ≥ 35 psi ≥ 30 psi
¼ inch. Dimensional ASTM
• Refer to the appropriate Duro-Last roof system Stability D 2126 ≤ 2.0%
specification and detail drawings for deck Water Vapor
preparation and attachment requirements. Permeance ASTM E 96 ≤ 3.5 perm
• Precautions must be taken to ensure that new ASTM
concrete decks have fully hydrated and do not Water Absorption C 272 ≤ 3.0%
continue to release moisture.
Flame Spread ASTM E 84 20
Panel Attachment: Smoke Developed ASTM E 84 150 - 300
• Panels may be attached to the roof deck using
mechanical fasteners or insulation adhesive. It Storage:
is acceptable to use these products in
combination. • Insulation must be protected from open flame
and kept dry at all times.
Mechanical Attachment
• Factory applied packaging is intended only for
• When installing multiple layers (which may protection during transit. Slit or remove the
include insulation, cover boards and thermal packaging to prevent accumulation of
barriers) it is acceptable to mechanically secure condensation.
through all layers.
• Store elevated (at least 3”) and completely
• Use fasteners intended for use with this covered with a weatherproof covering such as
product and that are supplied by or approved a tarpaulin.
by Duro-Last, Inc.
• Do not use panels which are wet or damaged.
Adhesive Attachment
• Insulation adhesive must be supplied by Duro-
Last, Inc. Refer to the adhesive’s product data Limitations:
sheet for application guidelines. Acceptable • Duro-Last, Inc. will not be responsible or liable
products: for any defects or problems related to building
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o Duro-Grip Insta-Stik™. or roof design by others, to deficiencies in
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o Duro-Grip Olybond . construction, to dangerous conditions on the
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o Duro-Grip Millenium Weather-Tite . job site, or to improper storage, handling or
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o Duro-Grip CR-20. 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: 11/4/2013