B. Non-Combustible Board And Drywall Installation - Heat & Glo SLR-X-AU Installation Manual

B. Non-Combustible Board and Drywall In-
stallation
Introduction
If the desired finished fireplace installation does not utilize
non-combustible finishing materials (such as tile, marble,
stone, etc.), special attention must be paid to the instal-
lation of drywall/gypsum wallboard to minimize potential
development of cracking and paint discoloration. Hearth
and Home Technologies has tested the following methods
and materials and therefore recommends the following
steps for the best drywall performance.
Attaching Non-Combustible Board to Framing
1. To ensure the lower cover panel has been correctly
installed, verify that two screws (total) have been in-
stalled in the lower left and right sides of the fireplace
opening. See Figure 8.1. These screws, when in-
stalled, will ensure the lower panel is correctly installed.
If the lower cover panel is not correctly installed, the
decorative front may not fit into the fireplace opening
correctly. Refer to section 6.D for more information
regarding the included non-combustible board.
2. The appliance ships with the required non-combus-
tible board. The large top piece of non-combustible
board is pre-installed at the factory. The narrow left
and right non-combustible pieces are shipped within
the appliance. Install the non-combustible side pieces
with the screws provided in the manual bag assembly.
There are pilot holes located on the left and right side
columns. Care should be taken not to tighten these
screws into the non-combustible board excessively.
Set screws flush to the face of the non-combustible
board. See Figure 10.2 and Section 6.D.
3. The outer perimeter of the factory-installed non-com-
bustible board has pre-drilled pilot holes. See Figure
10.1. Secure the non-combustible board to adja-
cent framing with drywall screws that are a minimum
of 1-1/4 inch in length. Care should be taken not to
tighten these screws into the non-combustible board
excessively. Set screws flush to the face of the non-
combustible board. See Figure 10.2 and Section 6.D.
4. When installing drywall around the appliance, install
a rectangular hole for the fireplace/non-combustible
board in a single sheet of drywall. This will minimize
the joints that require finishing adjacent to the fireplace
opening. Ensure that the 1/8 inch (3 mm) gap is main-
tained between the factory installed non-combustible
board and the surrounding drywall. See Figure 10.1.
Secure the drywall to the framing with screws a mini-
mum of one inch (25 mm) in length every six inches
(152 mm) across the top of the fireplace and every ten
inches (254 mm) on the sides of the fireplace.
5. To ensure good adhesion of drywall compounds and
tape, thoroughly clean the non-combustible board and
surrounding drywall to remove dust.
44
Heat & Glo • SLR-X-AU Installation Manual • 2493-980 Rev. B • 12/17
PRE-DRILLED
PILOT HOLES
Figure 10.1 Install Non-Combustible Board
Filling and Finishing Seams
1. Fill all gaps and joints between the non-combustible
board pieces and the drywall with a general purpose
chemically hardening joint compound, Hearth and
Home recommends Durabond® 45 Joint Compound
manufactured by USG (Sheetrock® brand). Use a
drywall knife to firmly press the joint compound into all
gaps. See Figure 10.1. Allow these joints to dry.
2. All joints are to be taped with a paper tape and embed-
ded with Durabond® 45 Joint Compound manufac-
tured by USG (Sheetrock® brand). Allow these joints
and paper tape to dry.
3. Depending on the technique used in steps 1 and 2,
two to three finishing coats are required to provide a
smooth and durable finish. Hearth and Home Tech-
nologies recommends ProForm® Lite-Blue Joint Com-
pound manufactured by National Gypsum. Allow each
coat to properly cure. Allow the finishing coat(s) to
cure for 24 hours before operating appliance.
Painting
If desired finishing includes a painted wall, a high-quality
100% acrylic latex paint with a high-quality latex primer
base coat are recommended around the appliance to limit
discoloration. Oil-based or standard acrylic paints may
be more prone to discoloration due to heat exposure.
In extreme cases, lab tests have shown yellow pigments
fading out of paints over time due to heat. Vent runs and
installation location will have an effect on wall tempera-
ture and fading. If fading occurs, consider avoiding paint
that contains yellow pigment.
FILL GAPS
APPLIANCE
OPENING