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Refer to FIGURE 2 for the depth requirements of a hearth extension. Hearth extension
requirements vary according to where the floor joists meet the hearth and what local code requires.
FIGURE 4: INSIDE WALL PAD INSTALLATION
NOTES:
1. If installing a fireplace furnace on an inside wall, refer to FIGURE 4. An inside wall
concrete pad must be six inches deeper than FIGURE 3 shows to allow for additional air
space required for inside wall installation.
2. Overall concrete pad and hearth extension sizes can be determined by referring to
FIGURE 3. Remember that a pad should contain rebar or steel mesh for stress reduction
and improved strength.
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3. All combustible ash pit forms should be removed before the concrete pad is poured, as
removal will be impossible once the concrete pad has been poured.