Heat & Glo LifeStyles Collection • Montana US-CAN • 4039-156 Rev C • 11/07
24
8
8
Finishing
A. Hearth Extension
A hearth extension must be installed with all
fi
replaces to
protect the combustible
fl
oor in front of the
fi
replace from
both radiant heat and sparks. See Figures 8.1 -8.3.
2 in. (51 mm)
required
High temperature
(300°F min.) continuous,
non-combustible sealant
Tile, stone or other
non-combustible material
Floor constructed of wood or
other combustible material
HX3 or HX4
Hearth Ext
or equivalent
insulation
(see Table below)
Fireplace
Protective
Metal Hearth
Strip
Figure 8.1 Hearth Extension Construction
1 in. (25 mm) overlap
Metal strips are placed 2 in. (51 mm) under the front
of the fireplace and must extend beyond the front
and sides of fireplace opening by 2 in. (51 mm).
Figure 8.2 Positioning the Protective Metal Hearth Strips
The hearth extension should slope away from the front of the
fi
replace and chase at 1/8 in. to 1/4 in. per foot. Spark strips
must be used on top of any combustible hearth materials
used for moisture management.
This
fi
replace has been tested and approved for use with a
hearth extension insulated to a minimum R value of 1.03.
To substitute materials for the factory-available hearth ex-
tensions, see Figure 8.3 and calculate insulation alterna-
tives as per Table 8.1 and the following formulas:
• Thermal conductivity per inch thickness =
k
• k = (BTU)(inch) / (foot
2
)(hour)(°F)
• Required thickness = Rk
• Thermal resistance per inch thickness =
r
• r = (foot
2
)(hour)(°F) / (BTU)(inch)
• Required thickness = R / rB.
A
B
C
Figure 8.3 Hearth Extension Dimensions
Fire Risk
• Metal hearth strips MUST be installed.
Sparks or embers may ignite
fl
ooring.
WARNING
Fire Risk
• Hearth extensions must be installed
exactly as speci
fi
ed.
High temperatures or hot embers may ignite
concealed combustibles.
WARNING
Table 8.1
CAT. #
A
B
C
HX3
in
52
16
8
mm
1321
406
203
HX4
in
66
20
12
mm
1676
508
305
Hearth Extension Insulation Alternatives-Total minimum R Value must equal 1.03
Material
k per inch
thick
r per inch
thick
Minimum
thickness
required
Hearth & Home HX3, HX4 (Micore 300™)
0.49
2.06
1/2 in.
USG Micore 160™
0.39
2.54
1/2 in.
USG Durock™ Cement Board
1.92
0.52
2 in.
Cement Mortor
5.0
0.20
5-1/8 in.
Common Brick
5.0
0.20
5-1/8 in.
Ceramic Tile
12.50
0.08
12-1/4 in.
Armstrong™ Privacy Guard Plus
0.46
2.18
1/2 in.
Marble
14.3-20.0
0.07-0.05
14-5/8 in. - 20-3/8 in.
¨
¨