USG Durock Cement Board - Manual (Page 3)

What You’ll Need
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Requirements
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.
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.
WARNING: Dust can contain silica.
Prolonged breathing can cause
lung damage and cancer. See
MSDS for more information.
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