Installing the Gas Fireplace
component builds on the next. If you have to make any
kind of an adjustment, do not try to do it
“by loading an
opening
” with mortar. That is completely unacceptable,
resulting in a fireplace that will not be plumb or level.
What you are advised to do is make use of wood shims.
You will find these small wood shims supplied with
the Mason-Lite Fireplace and you can nudge them in
between openings to achieve the precision you need in
making component adjustments.
6) Once you have inserted any shims, you will want to cover
any gaps that may have resulted with the grout.
Fireplace Assembly Procedures
7) Place the Mason-Lite
™ Fireplace hearth base on top of
your hearth ember shields. For concrete slabs, supporting
floor needs to be rated at ASTM 90.
8) a)
Combustible Floor Installations:
Place hearth
slabs on top of combustible floor. All-thread rods
should stick up through the holes on the hearth slabs.
b)
Non-combustible Floor Installations:
Mix a batch of
mortar and place on concrete slab making sure full
contact is achieved.
Fig. 12-1
Hearth ember shields
4" wide
26ga. galv.
metal strip
Extend 2"
all around
57"
Overlap 2" if
multiple strips
2"
9) Before installing the side walls, confirm placement of
outside combustion air side block (if required), this can
be installed either side depending on which side is
accessible to outside combustion air.
10) Prepare side wall footprint with the prepared mortar.
Follow instructions from step 2 for proper mortar
placement.
11) Keep the assembly of the next sections of the firebox
side walls moving up, keeping components moist,
mixing mortar as you need it and threading the mortar
appropriately as you stack each section, one onto the
next. Constantly check for squareness and levelness
while building each course of block. As you complete
each section, make certain that you adhere the mortar at
each and every joint.
Fig. 12-2
Setting Firebox sides
Fig. 12-3
Keep damp at all
times while applying
mortar.
IMPORTANT! Keep in mind that, when applying
the mortar, you must frequently run a damp
sponge to the parts before mortar is applied.
12) After the last side walls are in place, add #3 rebar rods
and fill the firebox cells with mortar mix. Mix approx. 2 cu.
ft. of sanded mortar mix. Put 25% in cells and place #3
rebars vertically into holes on the hearth base. If a raised
metal platform was installed, place adjacent to all thread
rods sticking through the cells. Make sure the bars are
into the hearth and at least 1/2
” (one-half inch) below top of
firebox top surface. Finish filling cells.
13) Set the lintel in place as shown in Fig. 13-1. Check
that all is level. If you need to make adjustments, use
shims. Place one or more of these shims between
the lowest wall component and the top surface of the
base plate. Once you are satisfied with the degree
of levelness, you can address any gap that may
have occurred with an appropriate amount of mortar.
Note:
Although you are cautioned to use MASON-LITE
mortar sparingly because it does have such holding
power, you should look over the firebox assembly at the
end and fill in any gaps, especially joint connections, with
the mortar. Needless to say, you must make adjustments
to be sure the fireplace is level and square while the
mortar is still wet.
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