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DURO-LAST VAPOR BARRIER

PRECAUTIONS: 3. Temporary roof (not immediately covered by a
1. Read Safety Data Sheets (SDS) prior to using. roof system)
2. Wear proper personal protective equipment, such a. Install according to the 6 steps shown below.
as gloves and eye protection, per the SDS. b. Cover and seal all T joints, transitions and any
ORDERING: other openings with Sopramastic.
Rolls may be ordered individually. Each roll c. Contractors are responsible for providing
measures 3.75 ft. by 133 ft. and will cover 465 adequate slope to roof drains to allow for
square feet with a 3-inch overlap. proper drainage of the roof area.
INSTALLATION:
1. Limitations TABLE 1. PHYSICAL PROPERTIES 2
a. The minimum ambient and surface Standards Results
temperature before application should be Thickness - 31.5 mils
14 F and rising.
b. Do not use during wet weather. Weight - 0.16 lb/sqft 1
c. Do not use on wet substrates. Tensile Strength ASTM D 5147 64 lbf/in x 88 lbf/in
1
Elongation ASTM D 5147 52% x 24%
d. Do not use on dirty or greasy substrates.
e. Do not use on substrates that show signs of Cold Bending ASTM D 5147 -31° F
deterioration or loss of structural integrity. Static Puncture ASTM D 5602 90 lbf 1
f. Do not use product after expiration date. Tear Resistance ASTM D 5601 84 lbf x 90 lbf
2. Duro-Last Vapor Barrier (immediately covered by Lap Adhesion ASTM D 1876 138 lbf
a roof system) Water Absorption ASTM D 5147 0.1% maximum
a. Install according to the 6 steps shown in the Peel Resistance ASTM D 903 83 lbf/ft
pictures below. Water Vapor Permeance ASTM E 96 .017 perm
(Pro. B)
ASTM E 283 . 2
Air Permeability < 0.007 L/sec m
(75 Pa)
1 Values are shown for both machine and cross machine
directions. The machine direction results are listed first.
2
All values are nominal.

1. Roll out the Duro-Last Vapor Barrier over a 2. Once the membrane is in place, while holding the 3. Install subsequent rolls of membrane in the same
clean, dry deck. membrane tight, peel off the silicone release film by way, taking care to overlap the longitudinal joints by
pulling diagonally. 3 inches.

4. On steel decks, at the end of a roll, install a metal 5. The membrane’s superior strength offers extra 6. Once installation is complete, the Duro-Last
plate (6 in. by 42 in.) to support the membrane end protection from heavy foot traffic during installation. Vapor Barrier membrane temporarily protects
lap between the metal flutes ensuring a complete The slip-resistant surface allows for safe movement against inclement weather. If not immediately
end lap seal. End laps must overlap by 6 inches. across the roof. covered, follow extra steps per 3a and 3b in the
instructions above.

www.duro-last.com 2 of 2 800-248-0280
Duro-Last, Duro-Guard, Duro-Fleece, Duro-Fleece Plus, Duro-Tuff and “World’s Best Roof” are registered marks owned by Duro-Last, Inc.
Created: 01/15/2014 Revised: 05/11/2015, 03/08/2016