USG Durock Cement Board - Manual (Page 5)

Countertop
Installation
1/4", 1/2", 5/8"
Wall and Ceiling
Installation
1/2" & 5/8" only
– Cover plywood base with D
urock
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.
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.
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" D
urock ™
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.
Finish
Install tile.
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