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Lighter. Easier. Faster.
Lightest Cement Board
Easiest to Cut and Fasten
20% Faster Installation
Installation Guide
Cement Board
1/2" and 5/8"
Outstanding base for floors, walls, ceilings and countertops
1/4"
Floors and countertops only
(1/4" Durock® cement board is not for walls or ceilings)
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Discover the Next Generation of
Durock® Brand Cement Board
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For more than 25 years, D
urock
cement board has set the standard for
proven performance in the backerboard category. Now this great product
is even better. The next generation of
D
urock
cement board not only
continues the brand’s tradition of quality and reliability, but now installs up
to 20% faster—and that provides a big boost to your productivity.
Other benefits include:
– Lightest cement board for easier handling
– Easiest to cut and fasten
– 30-year warranty
Water durable and mold resistant, with better tile bond than fiber-cement
boards or bare plywood, D
urock
is an outstanding backerboard for a wide
variety of materials. Choose this high performance alternative to fiber-cement
boards or bare plywood surfaces for:
Superior Tile Bond
Prevents tile pops and grout cracks, up to 40% greater tile
bond than fiber-cement board.
The Strength of Portland Cement
Will not swell, soften, rot, warp, delaminate or
disintegrate if exposed to water. Noncombustible. Backed by a 30-year
limited warranty.
Superior Mold Resistance
No mold growth as tested per ASTM G21.
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Requirements
What You’ll Need
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Floors 1/4", 1/2", 5/8"
thickness
– Subfloor should be minimum 5/8"
exterior-grade OSB or plywood.
Countertops 1/4", 1/2", 5/8"
thickness
– Minimum 3/4" exterior-grade
plywood base.
– Cover base with
D
urock
™
brand
tile membrane, 15 lb. felt or 4-mil
polyethylene and attach with 1/4"
galvanized staples.
Walls and Ceilings 1/2" and 5/8"
thickness only
– Maximum stud spacing: 16" o.c.
Maximum allowable deflection,
based on stud properties only,
L/360. Maximum fastener
spacing: 8" o.c. for wood and
steel framing; 6" o.c. for ceiling
applications.
Waterproofing
If waterproofing is desired, use
D
urock
tile membrane. See USG
literature piece CB492 for
D
urock
tile membrane product
information.
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Cutting
D
urock
panels should be cut to
size with a knife and straight edge.
A power saw should be used
only if it is equipped with a dust
collection device. Always wear a
NIOSH/MSHA approved mask and
eye protection when cutting
D
urock
panels.
– Utility knife: Using a straight
edge, score panel face with
utility knife and cut through
glass-fiber reinforcing mesh,
then snap and cut backside mesh
to break cleanly. Use a rasp to
smooth any rough edges.
– Power saw: Use a low-RPM
portable saw with 3-1/2"
carbide-tipped blade. To make
cutouts for pipes and fixtures,
use utility knife to cut through
mesh on both sides of panel and
punch out with a hammer from
back side. Or, use an electric drill
with a hole-saw bit.
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WARNING: Dust can contain silica.
Prolonged breathing can cause
lung damage and cancer. See
MSDS for more information.
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Floor Installation
1/4", 1/2", 5/8"
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Positioning
Fit ends and edges of panels
closely but not forced together,
maintaining 1/4" space between
panels and perimeter walls.
Stagger joints a minimum 16"
so that four corners never meet.
Offset panel joints a minimum 8"
from subfloor joints.
Leveling Bed
Apply type 1 organic adhesive with
5/32" v-notched trowel, latex fortified mortar with 1/4"
square-notched trowel. Comb out
adhesive or mortar in straight,
parallel rows (as shown below)
and immediately cover with panel.
Adhere panels to subfloor, one
panel at a time.
Fastening
Secure panels while adhesive is
still wet. Space fasteners 8" o.c.
around the perimeter and in the
field of the board.
Wood framing and countertops:
fasten with 1-1/2" 11-gauge hot dipped galvanized roofing nails,
D
urock
™
brand tile backer
or
screws for wood framing or
1-1/4"
D
urock
tile backer screws
for wood framing or equivalent.
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Joining
Fill joints with latex-fortified
mortar or Type 1 organic adhesive
and immediately embed alkali resistant, fiberglass mesh
joint tape.
Finishing
Tile or almost any flooring
material.*
* Not for use with vinyl flooring.
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Countertop
Installation
1/4", 1/2", 5/8"
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– Cover plywood base with D
tile membrane, 15 lb. felt or 4 mil
polyethylene and attach with 1/4"
galvanized staple.
Position
Fit ends and edges of panels
closely but not forced together.
Stagger panel joints from plywood
base joints.
Fasten
Space fasteners 8" o.c. around
the perimeter and in the field of
the board.
Joining
Fill joints with latex-fortified
mortar or Type 1 organic adhesive
and immediately embed alkali resistant, fiberglass mesh joint
tape.
urock
Wall and Ceiling
Installation
1/2" & 5/8" only
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Fastening
Fasten to studs spaced 16" o.c.
Space fasteners 8" o.c. for walls,
6" o.c. for ceilings. Fit ends and
edges of panels closely but not
forced together.
– Wood framing: 1-1/2" hot-dipped
galvanized roofing nails or 1-1/4"
D
urock
tile backer screws for
wood framing or equivalent.
– Steel framing: 1-1/4"
brand tile backer screws for steel
framing or equivalent.
Joining
Fill joints with latex-fortified
mortar or Type 1 organic adhesive
and immediately embed alkali resistant, fiberglass mesh joint
tape.
Shim
Place a 1/4" spacer strip or shim
around lip of bathtub or shower
pan to hold bottom edge of panel
off the fixture.
D
urock
™
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Finish
Install tile.
Note:
Because cement board fasteners
may protrude through the plywood
base when 1/4" cement board is
used, 1/2" or 5/8” cement board
is preferred in this application.
Finish
Install tile.
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Planning Your
Tile Installation
1/2" & 5/8" only
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Where tile will not cover entire wall
surface, such as above tub and
shower surrounds, determine
where you want the tile to end and
draw a level line at this height. Be
sure to allow for height of tile cap,
if applicable.
On walls where tile will reach the
floor, determine whether floor is
level by measuring distance to
desired tile height on both sides of
area to be tiled. If there is a differ ence (e.g., the floor is lower on one
side), lay one vertical row of tile
from highest point down to floor.
Affix tiles with dabs of mastic.
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On bathroom floors, start by
placing full tiles in front of bathtub
or shower and along the adjoining
wall to avoid cut tiles in this highly
visible area.
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Use this first row as a guide to
keep tiles and grout lines level and
ensure alignment with tiles of
adjacent tub or shower surround.
If new flooring will be installed,
leave a sufficient gap between
lowest tile and subfloor.
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Installing
Ceramic Tile
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Apply latex-fortified mortar or
Type 1 organic adhesive with a
notched trowel. Hold trowel at
an angle to maintain uniform
thickness. Refer to setting material
manufacturer for specific
information related to trowel type
and size.
Working a small area at a time,
press tile into place with a slight
twisting motion to seat properly.
Prevent adhesive buildup on
tile edge and in grout space.
If adhesive squeezes from under
tile, remove excess before it dries.
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Keep tiles and joints straight
and uniform. Use tile spacers
if desired.
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Trademarks
The following trademarks used herein
are owned by United States Gypsum
Durock, USG, USG in
Company:
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.
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).
For warranty or product
information and literature:
800 USG.4YOU (874-4968)
usg.com
Manufactured by
United States Gypsum Company
550 West Adams Street
Chicago, IL 60661
CB237EN/rev. 11-11
©2011 United States Gypsum Company
Printed in U.S.A.
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