Installing Non-Combustible Materials / Cement Board; Installing Combustible Materials / Drywall - Montigo R320-ST Installation & Maintenance Manual

R320-ST & 420 ST Power Vent Indoor Gas Fireplace
Step 3. As shown in Figure 3d; Use Cement Board, supplied by
Montigo, to overlap the new 2 x 4's and Non-combustible Header
(front & rear face) See Page 7 Figure 3c. Attach on all sides of the
glass, allowing 1/8" clearance from the rim of the fireplace opening.
Sheet metal screws to attach Non-Combustible
Cement board to Steel header, (supplied by Montigo)
Pre-drill for sheet metal screws to fasten
cement board to framing
Clearance required
for expansion of the
fireplace when
in operation
⅛"
Fasten cement board to unit using screws
removed from unit existing screw holes and
predrilled holes using sheet metal screws
Pre-drilled holes Top and Bottom using template for sheet meta
screws to fasten cement board to unit using previous screw holes
Figure 3d. Non-combustible Cement Board the Fireplace, (supplied by Montigo) Both Sides Typical.
Step 4. As shown in Figure 2e; Cut standard Drywall / Wall board
to complete the installation of Both surrounds.
Figure 3e. Fireplace installation (Cut the remainder of Drywall / Wall board to complete the fireplace surrounds) Both Sides Typical.
Page 8
Installation
Top piece attaches to non combustible header and fireplace. Bottom
piece attaches to fireplace and combustible horizontal framing
member. Side pieces attach to vertical 2x4s.
Non-Combustible cement board,
(Supplied by Montigo) or Equivalent
Combustible Drywall / Wallboard
or Equivalent (Top, Bottom & Sides)
Fasten Cement Board to
Non-Combustible Header using sheet
metal screws and Unit using srews
removed from unit in step 1 (see figure 3a
& 3b on page 7).
6" Height
Fasten Cement Board to Unit, using screws
removed in step 1, (see figure 3a & 3b on
page 7) and to combustible cross members
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