Specification

Technical Data
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. 11-11
© 2011 United States Gypsum Company
Printed in U.S.A.
Product Information
See usg.com for the most
up-to-date product information.
Warning
Dust can contain silica.
Prolonged and repeated
breathing of silica dust can
cause lung damage and
cancer. If cutting with a
power tool, use a wet or
vacuum saw to reduce the
amount of dust generated.
Dust can be corrosive to eyes,
skin, and respiratory tract.
Contact can cause severe
chemical burns. Wear eye,
skin and respiratory protection.
If eye contact occurs, flush
immediately with water for 30
minutes. If ingested,
call physician. Product safety
information: 800-507-8899 or
usg.com Customer Service:
800 USG-4-YOU
(800 874-4968).
KEEP OUT OF REACH
OF CHILDREN.
Trademarks
The following trademarks
are owned by United States
Gypsum Company or its related
companies:
Durock, USG and
USG in stylized letters.
Note
Products described here
may not be available in all
geographic markets. Consult
your United States 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.
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
Property Unit of Measure ASTM Test
Method
5/8" Durock
Cement Board
1/2"
Cement Board
1/4"
Underlayment
Flexural strength psi C947 > 480 > 750 > 1000
Indentation strength psi D2394 > 1250 > 1250 > 1250
Shear bond strength psi ANSI A118.4 > 50 > 50 > 50
Water absorption % by wt. 24 hrs. C473 15 15 15
Nail-pull resistance lb. (0.4" head
diameter, wet or dry)
C473 > 90 > 90 —
Weight psf C473 3 2.4 < 1.9
Freeze/thaw resistance procedure B, number of cycles
with no deterioration
C666 100 100 100
Mold resistance — G21 No growth No growth No growth
Noncombustibility Pass/Fail E136 Pass Pass Pass
Surface burning characteristics flame/smoke E84 0/0 0/0 0/0
Thermal “R”/k value C518 .49/1.27 0.39/1.27 —
Standard method for
evaluating ceramic floor tile
installation systems
Passes cycles 1-6 C627 Light commercial Light commercial Light commercial
Minimum bending radius ft. (requires special framing
details available upon request)
—
6 6 —