Hearth and Home Technologies RUTHERFORD-42 Noncombustible, Framing Material, 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 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

Figure 12.2 Hearth Extension Construction

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

Noncombustible

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.