Specification

Technical Data Property Unit of Measure ASTM 1/2" 5/16"
Test Method Cement Board Underlayment
Typical Value Typical Value
Flexural strength psi C947 > 750 > 1000
Indentation strength psi D2394 > 1250 > 1250
Shear bond strength psi ANSI A118.4 > 50 > 50
Water absorption % by wt. 24 hrs. C473 15 15
Nail-pull resistance lb. (0.4" head diameter, C473 > 90 —
wet or dry)
Weight psf C473 2.4 2.0
Freeze/thaw resistance procedure B, number of C666 100 100
cycles with no deterioration
Mold resistance — G21 No growth No growth
Non-combustibility Pass/Fail E136 Pass Pass
Surface burning flame/smoke E84 0/0 0/0
characteristics
Thermal “R”/k value C518 0.39/1.27 —
Standard method for Passes cycles 1-6 C627 Light Commercial Light Commercial
evaluating ceramic floor
tile installation systems
Minimum bending radius ft. (requires special framing— — 6 —
details available upon request)
Uniform Load —
1/2" Durock
Cement Board
Submittal Job Name
Approvals:
Contractor Date
Manufactured by
United States Gypsum Company
550 West Adams Street
Chicago, IL 60661
800 USG.4YOU (874.4968)
usg.com
CB399/rev. 11-10
© 2010, United States Gypsum Company
Printed in U.S.A.
seek medical advice. Inhalation
of dust may be corrosive or
cause chemical burns or
irritation to nose, throat
and respiratory tract. Avoid
breathing dust. Use in a
well-ventilated area or provide
sufficient local ventilation. If
dusty, wear a NIOSH/MSHA-
approved dust respirator. Wash
thoroughly with soap and water
after use. Do not ingest.
If ingested, call physician.
If cutting board with a power
tool, use a wet or vacuum saw
to reduce the amount of dust
generated. Panels are heavy
and can fall over, causing
serious injury or death. Avoid
creating a tripping hazard and
do not exceed floor limit loads.
Long-term breathing of
respirable crystalline silica dust
can cause permanent lung
damage and/or cancer.
Product safety information:
[phone] or usg.com.
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OF CHILDREN.
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companies: USG, Durock and
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Note
Products described here
may not be available in all
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your U.S. Gypsum Company
sales office or representative
for information.
Notice
We shall not be liable for
incidental and consequential
damages, directly or indirectly
sustained, nor for any loss
caused by application of these
goods not in accordance with
current printed instructions or
for other than the intended use.
Our liability is expressly limited
to replacement of defective
goods. Any claim shall be
deemed waived unless made
in writing to us within thirty
(30) days from date it was
or reasonably should have
been discovered.
Safety First!
Follow good safety/industrial
hygiene practices during
installation. Wear appropriate
personal protective equipment.
Read MSDS and literature
before specification and
installation.
Product Information
See usg.com for the most
up-to-date product information.
Warning
Portland cement is strongly
alkaline. Direct contact can be
corrosive and cause severe
damage or chemical burns to
the eyes and wet or moist skin.
Avoid contact with eyes and
skin. Wear eye protection,
alkali-resistant protective
gloves, long-sleeved shirts
and pants to prevent direct
contact. If eye contact occurs,
immediately flush thoroughly
with water for 30 minutes and
Stud Spacing Fastener Spacing Design Wind Load (I/240) Design Wind Load (I/360)
12" o.c. 8" o.c. 45 psf 45 psf
6" o.c. 60 psf 60 psf
16" o.c. 8" o.c. 33 psf 30 psf
6" o.c. 45 psf 30 psf
24" o.c.
(for shaft wall
assemblies only)
8" o.c. 13 psf 9 psf
6" o.c. 13 psf 9 psf