USG Fiberock Underlayment and Tile Backerboard - Manual (Page 10)

Glued-Down Wood Flooring
Installation of engineered or
solid hardwood glued-down
flooring must strictly follow
manufacturer's instructions.
Follow recommendations above
for underlayment installation.
Ceramic Tile
Tile Backerboard
Framing Requirements
Steel or wood wall framing
shall be structurally sound and
in compliance with local building
code requirements. Damaged
and excessively bowed studs
shall be replaced before installation
of tile backerboard panels.
Space wood or steel framing
24" o.c., maximum. Framing
shall be designed to meet L/360
deflection for tile and L/240
deflection for flexible finishes
such as paint.
Fastening
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 ring
shank roofing nails or
1-1/4" D
urock
screws for
wood framing or
equivalent.
– Steel framing: 1-1/4"
D
urock
screws for steel
framing or equivalent.
– Joining: Fill joints with
latex-fortified mortar or
Type 1 organic adhesive
and immediately embed
D
urock
tape or equivalent
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.
Joint Finishing
In areas that will be tiled, finish
joints with D
urock
tile backer
tape and latex-fortified mortar
or Type I mastic. In areas that
will be painted: For taping, use
S
heetrock
® brand joint tape
with S
heetrock
® D
urabonD
®
setting-type joint compound.
For finishing, use s
heetrock
®
all purpose joint compound.
Do not use P
lus
3 ® lightweight
all purpose or M
iDweight ™
joint
compounds on F
iberock
panels.
Planning Your Tile Installation
Where tile will not cover entire
wall surface, such as above
the 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.
Wall and Ceiling
Application
10