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IMPORTANT! Hearth extension design must be
determined before installation of fi replace.
Floor
Noncombustible
Framing Material
Noncombustible
Finishing Material
Protective Metal
Hearth Strips
1/2 in. Micore
or equivalent
insulation
Noncombustible
Material
Figure 11.3 Raised Platform Hearth Extension Detail
Raised Hearth Extension Framing
WARNING! Risk of Fire. A raised hearth extension built
fl ush with the fi replace opening (Figure 11.3) or less than
4 in. (102 mm) below the fi replace opening requires the
fi replace be installed on a non-combustible surface.
The hearth framing must be constructed of non-combus-
tible materials (Figure 11.2) and placed on 1/2 in. Micore,
or equivalent material (Figure 11.4). When creating the
platform, allow for the thickness of the non-combustible
fi nishing materials (Figure 11.5).
Noncombustible
Framing Material
1/2 in. Micore or
equivalent insulation
Figure 11.4 Raised Platform Hearth Extension-Framing Materials
2 in. (51 mm) of the Protective
Metal Hearth Strip is required
under the front of the fireplace
Tile, stone or other
non-combustible material
Floor constructed of wood or
other combustible material
Fireplace
Opening
4 in.
(102 mm) min.
Continuous, non-
combustible sealant
1/2 in. Micore Hearth
Extension (or
equivalent insulation)
See Table 11.2.
Figure 11.2 Hearth Extension Construction
B
A
C
C
D
4 in. (102 mm)
minimum between
bottom of fireplace opening
and finished surface of hearth extension
Figure 11.1 Hearth Extension Dimensions
Model # A B C D
EL36
in. 36 52 8 16
mm 914 1321 203 406
EL42
in. 42 66 12 20
mm 1067 1676 305 508
Heatilator • EL36/EL42 • 4044-132 • Rev V • 11/08