Heatilator Birmingham BIR42-B Installation Manual page 31

2. Raised Hearth Extension and Raised Fire-
place
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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.
20 in. minimum
Hearth Extension
1 in. Micore or
equivalent insulation
& 1/2 in. Durock
Figure 7.9 Raised Hearth Extension and Fireplace Framing Materials
3. Fireplace Opening and Hearth Extension
Flush with the Floor
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Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev AD • 06/23
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible finishing
material
Protective Metal
Non-combustible
Framing Material
Hearth Strips
Floor and platform constructed of
wood or other combustible material
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.
Finished
Floor
1 in. Micore and
1/2 in. Durock
or equivalent
insulation
Figure 7.10 Flush Hearth Extension Side View
Bottom of
fireplace opening
Platform must be built
to raise the bottom of
the fireplace opening
to the level of the
desired hearth height.
20 in. Min.
Hearth Extension
Non-combustible Finishing Material
Bottom of
Fireplace
Opening
Protective Metal
Hearth Strip