Heatiator BIR42 owner manual Raised Hearth Extension Framing, Non-combustible, Framing Material

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 1 in. Micore (or equivalent material) (Figure 12.4).

When creating the platform, allow for the thickness of the non-combustiblefinishing 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
1 in. Micore or	non-combustible material
			Protective
equivalent insulation
(see Table)			Metal Hearth
			Strip
	*	*

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

Figure 12.2 Hearth Extension Construction

Non-combustible	1 in. Micore or
Framing Material
	equivalent insulation
	& 1/2 in. Durock
Figure 12.4 Raised Platform Hearth Extension-Framing Materials

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

Bottom of fireplace opening

Platform must be built to raise the bottom of the fireplace opening to the level of the desired hearth height.

Non-combustible

Finishing Materials

Figure 12.5 Raised Platform Hearth Extension-Finishing Materials

1 in. Micore or	Protective Metal
	Hearth Strips	Floor
equivalent insulation
& 1/2 in. Durock
	Non-combustible
	Framing Material

Figure 12.3 Raised Platform Hearth Extension Detail

42 Heatilator • Birmingham BIR42 • 4059-308 Rev J • 1/11