Heat & Glo LifeStyle 50 Raised Hearth Extension Framing, Noncombustible, Finishing Materials

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 finishing materials (Figure 12.5).

IMPORTANT! Hearth extension design must be determined before installation of fireplace.

Continuous, non-combustible sealant

Durock	Tile, stone or other	Fireplace	Protective
Extensions or	non-combustible material
Two HX4 Hearth
equivalent insulation			Metal Hearth
(see Table)			Strip

Floor constructed of wood or	2 in. (51 mm)
other combustible material
	required

Figure 12.2 Hearth Extension Construction

Bottom of fireplace opening;
finished hearth surface must
NOT be above it.		Platform must be built
		to raise the bottom of
		the fireplace opening
Noncombustible		to the level of the
Finishing Material		desired hearth height.
Double	Protective Metal	Floor
	Hearth Strips
HX4 or
equivalent
& 1/2 in. Durock
	Noncombustible
	Framing Material

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.

Figure 12.3 Raised Platform Hearth Extension Detail

Noncombustible	2-HX4s or
Framing Material
	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

Heat & Glo • RUTHERFORD-50 • 4059-333 Rev C • 06/08 39