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

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

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

BIR42 specifications

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