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®
DURO-GUARD EPS FIBERGLASS FACER

Installation: Storage:
 Duro-Guard EPS Fiberglass Facer may be  Insulation must be protected from open flame
used directly under the Duro-Last and kept dry at all times.
membrane. Ensure that “bare” EPS is never  Factory applied packaging is intended only for
in direct contact with the membrane. Refer protection during transit. Slit or remove the
to the appropriate Duro-Last specification packaging to prevent accumulation of
for slip sheet and cover board condensation.
requirements.
 Store elevated (at least 3 inches) and
 Panels must be kept dry before, during and completely covered with a weatherproof
after installation. Install only as much insulation covering such as a tarpaulin.
as can be covered the same day with
completed roofing.  Do not use panels which are wet or damaged.
 The use of multiple layers of insulation with Limitations:
joints staggered between layers a minimum of
6 inches is recommended to eliminate thermal  Duro-Last, Inc. will not be responsible or liable for
bridging. any defects or problems related to building or roof
 Abut panel edges together and stagger joints of design by others, to deficiencies in construction,
adjacent panels. to dangerous conditions on the job site, or to
improper storage, handling or installation by
 Boards must be neatly fitted to roof deck and others.
around penetrations with no gaps greater than
¼ inch.
TABLE 2. TYPICAL THERMAL VALUES
 Refer to the appropriate Duro-Last roof system
specification and detail drawings for deck THICKNESS* R-Value
preparation and attachment requirements. inches mm TYPE VIII
1.00 25 4.2
 Precautions must be taken to ensure that new 1.50 38 6.3
concrete decks have fully hydrated and do not 2.00 51 8.4
continue to release moisture. 2.50 64 10.5
3.00 76 12.6
3.50 89 14.7
Panel Attachment: 4.00 102 16.8
Mechanical Attachment 4.50 114 18.9
5.00 127 21
 When installing multiple layers (which may 5.50 140 23.1
include insulation, cover boards and thermal 6.00 152 25.2
barriers) it is acceptable to mechanically secure * Contact Duro-Last for additional thickness options.
through all layers.
 Use fasteners and plates supplied by or TABLE 3. TYPICAL PHYSICAL PROPERTIES
approved by Duro-Last, Inc.
Property Test Method Type VIII
Membrane Attachment: Density ASTM C 303 1.25 pcf
(nominal)
Approved Adhesive/Membrane Combinations R-Value
®
 Duro-Grip CR-20 Membrane Adhesive. (per inch) ASTM C 518
or
®
®
o Duro-Fleece , Duro-Fleece Plus . @25°F C 177 4.55
4.25
@40°F
 WB II Adhesive (Water-Based). @75°F 3.92
®
o Duro-Last, Duro-Tuff , Duro-Fleece, Duro- Compressive Strength ASTM D 1621 13 – 18 psi
Fleece Plus, Duro-Last EV. (10% deformation)
 SB IV Adhesive (Solvent-Based). Flexural Strength ASTM C 203 ≥ 30 psi
o Duro-Last, Duro-Tuff, Duro-Last EV. Dimensional Stability ASTM D 2126 ≤ 2.0%
WB II and SB IV adhesives must not come in Water Vapor ASTM E 96 ≤ 3.5 perm
contact with bare EPS underneath the fiberglass Permeance
facer. Do not allow adhesive to get into joints. Water Absorption ASTM C 272 ≤ 3.0%
Adhesive must be applied using a 3/8-inch nap Flame Spread ASTM E 84 20
roller. Do not pour adhesive or use any type of
squeegee. Smoke Developed ASTM E 84 150 - 300

www.duro-last.com 2 of 2 800-248-0280
Duro-Last, “World’s Best Roof”, Duro-Bond, Duro-Grip, Duro-Fleece, Duro-Fleece Plus, Duro-Tuff and Duro-Guard are registered marks owned by Duro-Last, Inc.
RoofNav is a registered mark owned by FM Global.
Created: 01/17/2012 Revised: 03/19/2013, 11/04/2013, 05/05/2015