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Outdoor Lifestyles by Hearth & Home Technologies Inc. • 4070-300 Rev C • 4/11
23
D. Raised Hearth Extension Framing
The hearth framing must be constructed of non-combustible
materials (Figure 12.2) and placed on 1/2 in. Durock and 1
in. Micore (or equivalent material) (Figure 12.4). When cre-
ating the platform, allow for the thickness of the non-com-
bustible nishing materials (Figure 12.5).
IMPORTANT! Hearth extension design must be determined
before installation of replace.
* 2 in. (51 mm)
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible material
Floor constructed of wood or
other combustible material
1 in. Micore or
equivalent insulation
(see Table)
Fireplace
Protective
Metal Hearth
Strip
Durock
*
*
Floor
Non-combustible
Framing Material
Non-combustible
Finishing Material
Protective Metal
Hearth Strips
1 in. Micore or
equivalent insulation
& 1/2 in. Durock
Bottom of
fireplace opening
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.
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
Framing Material
1 in. Micore or
equivalent insulation
& 1/2 in. Durock
Non-combustible
Finishing Materials
Figure 12.3 Raised Platform Hearth Extension Detail
Figure 12.4 Raised Platform Hearth Extension-Framing Materials
Figure 12.5 Raised Platform Hearth Extension-Finishing Materials
Figure 12.2
Hearths should slope away from the front of the replace
and chase at 1/8 in. to 1/4 in. per foot. Spark strips must
be on top of any combustible hearth materials used for
moisture management.