Installation Guide

3
WHAT YOU’LL NEED
Floors thickness 1/4 in.
(6 mm), 1/2 in. (12.7 mm),
5/8 in. (16 mm)
Subfl oor should be minimum
5/8 in. (16 mm). APA span-
rated plywood or OSB with
an Exposure 1 classifi cation
or better.
Countertops 1/4 in. (6 mm),
1/2 in. (12.7 mm), 5/8 in.
(16 mm) thickness
Minimum 3/4 in. (19 mm).
APA span-rated plywood
or OSB with an Exposure 1
classifi cation or better.
Cover base with USG
Durock™ Brand Tile
Membrane, 15 lb. (6.8 kg)
felt or 4-mil polyethylene
and attach with 1/4 in.
(6 mm) galvanized staples.
Walls and Ceilings 1/2 in.
(12.7 mm) and 5/8 in.
(16 mm) thickness only
Maximum stud spacing:
16 in. (406 mm) o.c. Maximum
allowable defl ection, based
on stud properties only,
L/360. Maximum fastener
spacing: 8 in. (203 mm) o.c.
for wood and steel framing;
6 in. (152 mm) o.c. for
ceiling applications.
Waterproofi ng
If waterproofi ng is desired,
use USG Durock™ Brand
Waterproofi ng Membrane or
USG Durock™ Brand Liquid
Waterproofi ng Membrane.
See USG Durock™ Brand
Waterproofi ng Membrane
submittal sheet (CB595) or
USG Durock™ Brand Liquid
Waterproofi ng Membrane
submittal sheet (CB817)
for product information.
Cutting
USG Durock® Brand Cement
Board with EdgeGuard™
panels should be cut to size
with a knife and straightedge.
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
USG Durock® Brand panels.
• Utility knife: Using a
straightedge, score panel
face with utility knife and
cut through glass-fi ber
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 in.
(89 mm) carbide-tipped
blade. To make cutouts for
pipes and fi xtures, 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 SDS
for more information.