20
Assembly Instructions
1. Place the Mason-Lite Fireplace hearth base on top of your
non-combustible floor or metal base. For concrete slabs,
supporting floor needs to be rated at ASTM 90.
2. a)
Combustible Floor Installations:
Mix up a batch of
mortar and adhere hearth slabs to the cement board (see
Figure 25). All-thread rods should stick up through the
holes on the hearth slabs.
b)
Non-combustible Floor Installations:
Draw an
outline of the hearth area based on the dimensions shown
in pages 8 and 9. Position Hearth slabs and mark rebar
center locations. Drill 4 inches into concrete slab and
secure the 8 pieces of 12 inch rebar with epoxy.
3. Mix a batch of mortar and prepare Right Side Hearth
bottom surface to be bonded as shown in Figure 27.
4. Align Right Side Hearth to the outline created. The overall
width should allow for an approximate gap of 1/8” between
slabs for the additional mortar to unite the remaining slab.
Check for surface flatness, level if necessary.
5. Apply mortar to the remaining Hearth except this time apply
beading on surface to be facing floor as shown in Figure 28.
6.
Before installing side walls, confirm placement of outside
combustion air access (if required), this can be installed
either side depending on which side is accessible to
outside combustion air (all diagrams in this manual show
the combustion air inlet hole on the right side). Prepare side
wall and rear wall mating surfaces with the prepared mortar
and begin assembly.
7.
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.
Figure 27
1/2” AWAY
FROM EDGES
1/2” MORTAR
BEAD TYPICAL
Hearth section shown prepared
for Right Side position
APPLY MORTAR
BEAD TO ALL
MATING SURFACES
Figure 28
Hearth shown prepared
for Left Side position
MFP-33/39/44/49 Fireplace Assembly
Figure 29
Side Wall shown prepared for Right
Side Air Access.
For Left Side, bead opposite side.
1/2” AWAY
FROM EDGES
Figure 30
Combustion Air Access
Right or Left (Right shown).
Apply
mortar
Apply mortar
Side Wall
Rear Wall
Side Wall
For MFP-33 installation continue to next page, for MFP-39/44/49 installation turn to page 22.
Figure 26
Two 26 ga. galv.
hearth ember
shields required
(not supplied)
Left Side Hearth 2nd
Right Side Hearth 1st
Model
W
MFP-33
37”
MFP-39
43”
MFP-44
48”
MFP-49
53”
W
28”
Apply mortar
between joints
12 inch rebar
