Hearth and Home Technologies CASTLEWOOD 42 Raised Hearth Extension Framing, Non-combustible

D. Raised Hearth Extension Framing

The hearth framing must be constructed of non-combustible materials (Figure 12.2) and placed on 1/2 in. Durock and 1 in. Micore (or equivalent material) (Figure 12.4). When cre- ating the platform, allow for the thickness of the non-com- bustible finishing materials (Figure 12.5).

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

Continuous, non-combustible sealant

Figure 12.2

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.

Figure 12.3 Raised Platform Hearth Extension Detail

Hearths should slope away from the front of the fireplace and chase at 1/8 in. to 1/4 in. per foot. Spark strips must be on top of any combustible hearth materials used for moisture management.