11
Combustible Floor Installations
8” Metal Base
The Grand Meridian Metal Base ensures the minimum
8” (eight inch) clearance above combustible flooring is
maintained.
A layer of 1/2” minimum Concrete Board is required on
the top and mid section below as shown in
Figure 17
. The
required sizes are shown in the table below.
1/2” Thick Cement Board Dimensions
Model
A1
A2
B1
B2
MMST43
53”
28”
48”
23”
Figure 17 Metal Base Assembly
26 ga. galv.
Hearth Ember Shields
Anchor Bracket All-Thread Rods are secured to the
bottom flange
of the Metal Base with eight (8) flat washers (2”OD x 9/16”ID x
0.10”) and eight (8) 1/2-13 UNC Nuts.
Place Cement Board
on top rails of platform.
Place Cement Board on
top of cross-members.
Eight (8) All-Thread Rods are secured to the
top flange
of the Metal Base with sixteen (16) flat washers (2”OD x
9/16”ID x 0.10”) and sixteen (16) 1/2”-13 UNC Nuts.
A1
B2
B1
A2
IMPORTANT:
Remember to tighten up nuts below the floor after fireplace
installation in order to take up any slack in the threads.
Hearth Ember Shield:
Metal safety stripping is required between the front of the
Fireplace Hearth and Hearth Extension (not supplied). A 26
gauge galvanized 4” wide metal strip can be used. The length
needs to extend 2 inches beyond each side of the fireplace
opening. If two strips are used, make sure they overlap at
least two inches in the middle. The strip is placed about 2” into
the underside of the platform at the front of both openings on
the fireplace.
Note: When using an on-site-constructed hearth extension,
you may use a sand-cement grout between the hearth and
extension instead.
What You Will Need
You will find that the Grand Meridian Fireplace is designed
to be completely assembled on-site, consisting of interlocking
precast parts. You will need a thin-set type mortar for bonding.
The parts of the fireplace are made of incredibly strong blend
of specialty cement and a light weight aggregate.
IMPORTANT! When applying mortar, it is imperative that the
concrete blocks be maintained moist (not soaking) so they
don’t absorb the water out of the mortar and cause adhesion
to fail. Frequently run a damp sponge to the parts before
mortar is applied!
The installation of an anchor plate/damper is required but
not supplied. You may purchase it from IHP. Also, an optional
combustion air inlet MM4-AK can be obtained from IHP.
Refractory Firebrick Liners also need to be installed. These
should be a minimum of 1-1/8” (one and one-eight inches)
thick. The liner will be applied within the walls and hearth area
of the firebox.
TOOLS NEEDED FOR INSTALLATION:
• One 4 ft. level
• Roto-hammer with ½” drill bit
• Drill motor with mixer blade to mix Mortar
• Two empty 5 gallon buckets to mix Mortar
• One wheelbarrow
and shovel to mix concrete
• Grout bag
• Triangular masonry trowel
• Rubber hammer
• Sponge and 2 water buckets to wipe down and moisten
parts prior to applying mortar
MATERIALS NEEDED FOR INSTALLATION:
• Epoxy for securing rebar in footing / foundation
• Three (3) - 90 lb. bags of ready mix concrete with ¼” or
smaller aggregate
MATERIALS INCLUDED:
• 8 - ⅜” Rebar x 28” Long
• 8 - ⅜” Rebar x 12” Long
• 1 - 50 lb. bucket Mortar
• 20 - Small Wood Shims
Fireplace Assembly Procedures
