Specifications

As shown in Figure 19; Install the supplied Non-combustible cement board to overlap the new Horizontal & Vertical 2 x 4's, See Figure 5.
Place the Non-combustible wall board above the replace throat, allowing 1/8" clearance from the rim above the replace opening. Pre-drill
the board with 1/8" drill and secure to framing with Nails, use at heat sheet metal screws to fasten the board to the metal header.
(Non-Combustible cement board R520*: 72" x 15 1/2" R620*: 82 1/2" x 15 1/2" x 3/8")
 Non-combustible Board over the Fireplace, (supplied by Montigo).
Non-Combustible cement board,
(supplied by Montigo) or Equiv.
Pre-drill for Nail fasteners
Combustible framing
Sheet metal Screws to attach Non-Combustible
cement board to Steel header.
1/8”
Clearance required for
expansion of the fireplace
when in operation.
Section 7: Finishing the replace
Wall board / Gyproc or
Equiv. (Bottom & Sides)
Cut standard Gyproc / Drywall board to complete the installation of the surround. Fit the edge of the board to the rim around the replace
opening. Fasten the board in place using standard drywall screws.
 Fireplace installation (Cut the remainder of Gyproc / Wall board to complete the replace surround).

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