Raised Hearth Extension Framing - Outdoor Lifestyles ODCASTLEWD-42-B Owner's Manual

D. Raised Hearth Extension Framing
The hearth framing must be constructed of non-combustible
materials (Figure 9.2) and placed on 1/2 in. Durock and 1 in.
Micore (or equivalent material) (Figure 9.4). When creating
the platform, allow for the thickness of the non-combustible
finishing materials (Figure 9.5).
IMPORTANT! Hearth extension design must be determined
before installation of fireplace.
Continuous,
non-combustible sealant
Durock Tile, stone or other
non-combustible material
1 in. Micore or
equivalent insulation
(see Table)
Floor constructed of wood or
other combustible material
Figure 9.2
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. Min.
Hearth Extension
Non-combustible
Finishing Material
1 in. Micore or
equivalent insulation
& 1/2 in. Durock
Figure 9.3 Raised Platform Hearth Extension Detail
24 Outdoor Lifestyles by Hearth & Home Technologies Inc. • ODCASTLEWD-42-B • 4070-160 Rev A • 10/22
Protective
Metal Hearth
Strip
*
*
* 2 in. (51 mm)
Bottom of
fireplace opening
Platform must be built
to raise the bottom of
the fireplace opening
to the level of the
desired hearth height.
Protective Metal
Hearth Strips Floor
Non-combustible
Framing Material
Non-combustible
Framing Material
Figure 9.4 Raised Platform Hearth Extension-Framing Materials
Non-combustible
Finishing Materials
Figure 9.5 Raised Platform Hearth Extension-Finishing Materials
Hearths should slope away from the front of the fireplace
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.
1 in. Micore or
equivalent insulation
& 1/2 in. Durock