Heatilator Birmingham BIR42-B Installation Manual page 30

1. Fireplace Installed Flush on the Floor and
Hearth Extension Raised to Bottom of Firebox
Opening
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Note: The bottom of the fireplace opening is 3-3/4 in. (95.3mm) above
the bottom of the fireplace. Finished hearth must NOT extend above this
level.
Continuous,
non-combustible sealant
Durock Tile, stone or other
non-combustible material
1 in. Micore and 1/2
in. Durock or
equivalent insulation
(see Table)
Floor constructed of wood or
other combustible material
Note: For installations
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Figure 7.5 Hearth Extension Construction
Vinyl Flooring
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 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev AD • 06/23
Protective
Metal Hearth
Strip
*
*
* 2 in. (51 mm)
Note: The bottom of the fireplace
opening is 3-3/4 in. (95.3 mm)
above the bottom of the
fireplace. Finished hearth must
NOT extend above this level.
Noncombustible
Finishing Material
20 in. Min.
Hearth Extension
Noncombustible
Framing Material
1 in. Micore and
1/2 in. Durock
or equivalent
insulation
Figure 7.6 Raised Platform Hearth Extension Detail
Noncombustible
Framing Material
Figure 7.7 Raised Platform Hearth Extension-Framing
Non-combustible
Finishing Materials
Figure 7.8 Raised Platform Hearth Extension-Finishing
Floor
Protective Metal
Hearth Strips
HX4 or
equivalent