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IMPORTANT! Hearth extension design must be
determined before installation of fi replace.
Floor
Noncombustible
Framing Material
Noncombustible
Finishing Material
Protective Metal
Hearth Strips
HX4
20 in. Min.
Hearth Extension
Figure 11.3 Raised Platform Hearth Extension Detail
Raised Hearth Extension Framing
The hearth framing must be constructed of non-com-
bustible materials (Figure 11.2) and placed on an HX4,
or equivalent material (Figure 11.4). When creating the
platform, allow for the thickness of the non-combustible
fi nishing materials (Figure 11.5).
Noncombustible
Framing Material
HX4 or
equivalent
Figure 11.4 Raised Platform Hearth Extension-Framing Materials
Noncombustible
Finishing Materials
Figure 11.5 Raised Platform Hearth Extension-Finishing Materi-
als
2 in. (51 mm)
required
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible material
Floor constructed of wood or
other combustible material
HX4 Hearth Ext
or equivalent
insulation
(see Table 11.2)
Fireplace
Protective
Metal Hearth
Strip
Figure 11.2 Hearth Extension Construction
Heat & Glo • EXCLAIM-36, EXCLAIM-42 • 4013-251 Rev C • 11/08