Fireplace Installed Flush On The Floor And Hearth Extension Raised To Bottom Of Firebox Opening - Majestic Ashland ASH42 Series 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
fireplace opening is required.
The hearth framing must be constructed of non-com-
bustible materials (such as metal framing or equivalent
material) and placed on HX3(s) or HX4(s) and 1/2 in.
Durock, or equivalent material. Refer to Figure 7.5.
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: 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.
Continuous,
non-combustible sealant
Durock Tile, stone or other
non-combustible material
1 in. Micore and 1/2
in. Durock or
equivalent insulation
(see Table)
Floor constructed of wood or
other combustible material
Figure 7.5 Hearth Extension Construction
30 Majestic Ashland Series • ASH42 Installation Manual • 4059-915 • Rev M • 07/20
Protective
Metal Hearth
Strip
*
*
* 2 in. (51 mm)