CertainTeed CTG_Moulding - Manual (Page 2)

Cove / Cornice Templates
STEP 1: Cut out the attached templates. Select
the mitre you want, using the corresponding
numbering referred to in the sketch.
Note: For an external mitre, the joint will be cut on
an angle and the ceiling edge length will be longer
than the wall edge length. Before cutting, always
mark the overall length required on the wall edge
side of the Cove/Cornice.
STEP 2: Fold the template along the dotted
lines. Place the template on the curved surface
of the Cove/Cornice placing the marked folds
on the appropriate wall and ceiling edges.
STEP 3: Follow the appropriate template edge
with a pencil to mark the required cut.
STEP 4: Stand the Cove/Cornice on an edge
and cut into the curve.
STEP 5: Lightly sand any rough edges.
STEP 6: Most walls are slightly uneven, so
don’t worry if the mitres do not meet exactly
or if there are gaps at the edges. Fill them with
joint compound.
STEP 1: SURFACE PREPARATIoN
Begin by penciling in
guidelines along the
walls, 3 1/4" (83 mm)
for Cove, 3 5/8" (92
mm) for Cornice, from
the wall and ceiling joint.
Scrape off any existing wallpaper or loose
paint between the guidelines, and rough-
en the surface to provide a grip for the
CertainTeed Joint Compound. Brush
off any dust or loose particles.
STEP 2: CUTTING
Cut the Cove or Cornice
to length, using a
fine-tooth saw. Mitre
it using either the
appropriate template
on this page or a mitre
block or mitre saw.
Always cut into the curve of the Cove/
Cornice to avoid tearing the face paper.
Lightly sandpaper any rough edges.
Note: Cornice is installed
with the thicker portion
of the cornice closest to
the ceiling, as shown.
Tip: For a clean joint,
be sure the ends are
square, then apply a
generous layer of joint compound to each
end before butting the two pieces together.
STEP 3: INSTALLATIoN
Spread joint compound
onto the back of the
Cove/Cornice along the
surfaces that will meet
the wall and the ceiling.
The compound should
be spread thick enough
to push out and fill any uneven surfaces
between wall and ceiling.
You can provide temporary support by
placing a few screws in the wall through
the Cove/Cornice until the compound dries.
wipe off compound that has squeezed out
from under the Cove/Cornice and fill any
remaining gaps.
Coat all joints with compound (up to three
coats) and lightly sand until the surface is
smooth.
Remove the last traces of compound with
a damp sponge or light sanding, and
allow to dry for about 24 hours.
STEP 4: FINISHING
Having ensured that all gaps and joints
have been filled with joint compound and
the installation has been allowed to dry
thoroughly, prime and paint as desired.
Cove/Cornice are suitable for most types
of decorative paint finish, but before
painting, the profile should be treated
with primer recommended for drywall by
the paint manufacturer.
Tip: Avoid using screws directly into studs
when installing Cove/Cornice. If stud moves
at all, screws could pop and require
follow-up repair.
Tip: If you’re ever in doubt, your CertainTeed
dealer is always a willing and reliable source of
helpful advice.
Installation Instructions: Cove / Cornice
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