Astria.us.com
125160-01_D
22
1/2" Thick Cement Board Dimensions
Model
A1
A2
MM33
37"
28"
MM39
43"
28"
MM44
48"
28"
MM49
53"
28"
Grand Meridian
Model
Use Metal Base
Model
MM33
MMB33
MM39
MMB39
MM44
MMB44
MM49
MMB49
Figure 32 - MMB63 Metal Base Assembly
COMBUSTIBLE FLOOR INSTALLATION
Continued
Figure 33 - MMB33, MMB39, MMB44 and MMB49
Metal Base Assembly
MATERIALS INCLUDED:
• 8 -
3
/
8
”
Rebar x 12” Long
• 4 -
3
/
8
”
Rebar x 6” Long
• 4 -
3
/
8
”
Bolts x 2½” Long
• 28 - Washer
• 28 - Nuts
• 4 - Floor Joist Brackets
• 2 - Ember Protector Strips
• 1 - Insulation Blanket
A layer of 1” thick Insulation Blanket (Included) is required on the
top and mid-section of the Metal Base as shown in Figure 33. The
required sizes are shown in the following table:
NOTE:
The insulation (concrete) board chosen must meet a thermal
conductivity rating
≥
0.4 Btu-in/hr-ft²-F°.
6" METAL BASE (MMB33, MMB39, MMB44, AND MMB49)
The Metal Base ensures the minimum 6” clearance above
combustible flooring is maintained.
67"
(1702 mm)
28" (712 mm)
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 of
platform.
Place 1
"
thick
Fiberglass Blanket
under Platform.
Four (4) All-Thread Rods are secured to the top 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 1” Fiberglass
Insulation Blanket
under platform.
Place 1/2” cement
board on top of
platform. May be a
single piece or two
halves as shown.
Hearth Ember Shields
26 ga. galvanized
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.
Four (4) All-Thread Rods are secured to
the top 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.
26 ga. galv.
Hearth Ember
Shields
A1
A2