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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
Double
HX4 or
equivalent
& 1/2 in. Durock
Bottom of fireplace opening;
finished hearth surface must
NOT be above it.
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.
Figure 12.3 Raised Platform Hearth Extension Detail
Raised Hearth Extension Framing
The hearth framing must be constructed of non-combus-
tible materials (Figure 12.2) and placed on 1/2 in. Durock
and two HX4s (or equivalent material) (Figure 12.4). When
creating the platform, allow for the thickness of the non-
combustible fi nishing materials (Figure 12.5).
Noncombustible
Framing Material
2-HX4s or
equivalent
& 1/2 in. Durock
Figure 12.4 Raised Platform Hearth Extension-Framing Materials
Noncombustible
Finishing Materials
Figure 12.5 Raised Platform Hearth Extension-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
Two HX4 Hearth
Extensions or
equivalent insulation
(see Table)
Fireplace
Protective
Metal Hearth
Strip
Durock
Figure 12.2 Hearth Extension Construction
Heat & Glo • RUTHERFORD-50 • 4059-333 Rev C • 06/08