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40
Hearth extension design must be
determined before installation of replace.
20 in. Min.
Hearth Extension
Floor
Non-combustible
Framing Material
Non-combustible
Finishing Material
Protective Metal
Hearth Strips
1/2 in. Micore
or equivalent
insulation
The hearth framing must be constructed of non-combusti-
ble materials and placed on an HX4 or equivalent material
(Figures 11.2-11.4). When creating the platform, allow for
the thickness of the non-combustible nishing materials
(Figure 11.5).
1/2 in. Micore
or equivalent
Hearth must
extend at least
12 in. beyond
the fireplace
opening on both
sides.
20 in. Min.
Non-combustible
Framing Material
Non-combustible
Finishing Materials
2 in. (51 mm)
required
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible material
Floor constructed of wood or
other combustible material
1/2 in. Micore
or equivalent
insulation
(see Table 11.2)
Fireplace
Protective
Metal Hearth
Strip
Heat & Glo • EXCLAIM-50 • 4013-041 • Rev AA • 7/12