USG Fiberock Underlayment and Tile Backerboard - Manual (Page 8)

Working a small area at a
time, set tile with a slight
twisting motion and press into
place. Avoid adhesive buildup
on tile edge and in grout space.
Keep tiles aligned so joints are
straight and uniform. Use tile
spacers if desired.
Note:
Refer to ANSI A108.4
or A108.5 for complete tile
installation instructions. Refer
to setting material manufacturer
for specific information related
to trowel type and size, proper
tile type and size, mixing
instructions, and set and cure
times.
Resilient Flooring
Underlayment
Selecting Fasteners
Fasten F
iberock
underlayment to
subfloor with 1/4" crown chisel
point staples. Do not use screws
or nails.
Fastener length should be
approximately equal to combined
thickness of underlayment and
subfloor. Do not allow fasteners
to penetrate through subfloor.
Fastening Panels
Lay panels flat and press tightly
onto subfloor while fastening.
Begin fastening where three
panels intersect. Affix staples
along joints in a zipper
pattern at 1" o.c., 1/4" from
panel edge. Install staples at 4"
o.c. in the field of panels.
1/4”
Consult your USG F
iberock
representative for additional
fastening techniques.
When using pneumatic tools,
apply sufficient pressure on gun
to prevent the tool from bouncing.
Set pneumatic tool pressure to
drive fasteners flush or slightly
below underlayment surface.
To prevent fastener heads from
telegraphing through resilient floor
covering, do not countersink more
than 1/16" below surface.
Fasten one panel at a time.
Begin at one end and fan out
across the floor.
Installing F
iberock
Panels over
Existing Vinyl Floor Coverings
Do not install underlayment over
heavily cushioned, thick foam-
backed vinyl. Ensure that existing
floor is level, is fully adhered and
well bonded, and meets
appropriate design requirements.
Repair missing or broken tiles,
curling seams, severe gouges,
protrusions of surface and any
other damage with a high-quality
floor leveler. Follow floor-
covering manufacturer's
recommendations for
installations over existing floors.
Floor Application
8