Fireplace Installed Flush On The Floor And Hearth Extension Raised To Bottom Of Firebox Opening - Majestic Biltmore SL1100 Installation Manual

1. Fireplace Installed Flush on the Floor and
Hearth Extension Raised to Bottom of Firebox
Opening
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.
The hearth framing must be constructed of non-com-
bustible materials (such as metal framing or equivalent
material) and placed on HX4, or equivalent material.
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.
Note: Maximum height from floor under fireplace to
top of finished hearth extension is 8 3/4 in. (222 mm).
Bottom of fireplace opening
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible material
1/2 in. Micore
or equivalent
insulation
Floor constructed of wood or
other combustible material
Figure 7.4 Hearth Extension Construction
Majestic Biltmore Series • SB100 • 4013-303 Installers Manual • Rev H • 08/20
32
Protective
Metal Hearth
Strip
2 in. (51 mm)
required
Note: The bottom of the fireplace
opening is 8 3/4 in. (222 mm)
above the bottom of the
fireplace. Finished hearth must
NOT extend above this level.
Noncombustible
Finishing Material
Hearth Extension
Noncombustible
Framing Material
1/2 in. Micore
or equivalent
insulation
Figure 7.5 Raised Platform Hearth Extension Detail
Noncombustible
Framing Material
Figure 7.6 Raised Platform Hearth Extension-Framing
Non-combustible
Finishing Materials
Figure 7.7 Raised Platform Hearth Extension-Finishing
20 in. Min.
Floor
Protective Metal
Hearth Strips
HX4 or
equivalent