Raised Hearth Extension And Raised Fireplace - Heatilator A36C Installation Manual

2. Raised Hearth Extension and Raised Fire-
place
Non-combustible flooring a minimum of 16 in. (406 mm)
in front of and 8 in. (203 mm) to each side of the fuel
opening is required (A36).
Non-combustible flooring a minimum of 20 in. (508 mm)
in front of and 12 in. (305 mm) to each side of the fuel
opening is required (A42)021.
The hearth framing must be constructed of non-com-
bustible materials (such as metal framing or equivalent
material) and placed on HX3(s), HX4(s), or equivalent
material. See Figure 7.8.
When creating the platform, allow for the thickness
of the non-combustible finishing materials.
Seal gaps between the hearth extension and the front
of the fireplace with a bead of non-combustible sealant
or grout.
16 in. (A36) or 20 in. (A42)
minimum Hearth Extension
1/2 in. Micore
or equivalent
insulation
Figure 7.8 Raised Hearth Extension and Fireplace Framing Materials
Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
30
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible finishing
material
Protective Metal
Hearth Strips
Non-combustible
Framing Material
Note: Maximum height from floor
under fireplace to top of finished
hearth extension is 2 in. (51 mm).
Platform must be built
to raise the fireplace
for the desired hearth
height.
Floor and platform constructed of
wood or other combustible material