Installation Instructions

Correcting Joint
Imperfections
Use USG Durock
™
patching
compound or equivalent
sparingly to fill wide joints,
repair any surface voids
and correct joint lippage
(panel edge sitting above
or below the floor plane).
Carefully fill joints wider
than 1/32" and any surface
imperfections with only
enough material to infill void
– do not feather. Correct joint
lippage by applying patching
compound to low side only
and feathering to level. Allow
compound to dry completely
(90 min. minimum), then
lightly sand or scrape, taking
care not to scu panel surface;
use a flat blade to scrape away
any excess material.
Remove all debris from panel
surfaces; vacuum carefully to
eliminate excess dust and dirt.
Applying Floor Covering
Refer to floor-covering
manufacturer's
recommendations for proper
procedures. For proper
trowel selection, refer to
adhesive manufacturer's
recommendation for
nonporous substrates.
Follow floor-covering and/
or adhesive manufacturer's
guidelines for setting times
before allowing trac on the
finished floor. Follow floor-
covering manufacturer's
recommendations for
preventive maintenance,
cautions and procedures.
Perimeter-Bonded, Felt-
Backed Resilient Floor
Covering
Joint patching is not required
with this type of floor covering
in new construction unless
joint spaces or lippage exceed
1/32". Carefully fill joints wider
than 1/32" with only enough
material to infill void —do
not feather. Correct joint
lippage by applying patching
compound to low side only
and feathering to level. Allow
compound to dry completely
(90 min. minimum), then
lightly sand or scrape, taking
care not to scu panel surface.
Remove dust, dirt and debris
from underlayment surface
before application of floor
covering.
Wood Flooring
Underlayment
Mechanically Fastened
Wood Flooring
Fasteners must be long
enough to penetrate through
USG Fiberock underlayment
and into subfloor. To
determine proper fastener
length, add thickness of
underlayment to length of
fastener recommended by the
flooring manufacturer. Follow
recommendations on pages
6 and 8 for underlayment
installation.
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