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1. Fireplace Installed Flush on the Floor and
Hearth Extension Raised to Bottom of Firebox
Opening
Non-combustible flooring a minimum of 16 in. (406 mm)
in front of and 8 in. (203 mm) to each side of fireplace
opening of the EM-415 20 in. (508 mm) in front and 12
in. (305 mm) to each side of the EM-485T 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), HX4(s), or equivalent
material. See Figures 7.4 and 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: Maximum height from floor under fireplace
to top of finished hearth extension is 2 in. (51 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
Note: For installations
with vinyl flooring, special
clearance recommenda-
tions apply.
►
Figure 7.4
Hearth Extension Construction
►
Vinyl Flooring
Vinyl Flooring is sensitive to heat. A 48 inch minimum
depth hearth extension is recommended when using
vinyl flooring up to the wall. See Figure 7.4.
Notice: Clearances that do not meet the minimum
guidelines could result in damage or buckling to the
vinyl flooring and is done at the installer's risk.
Hearth and Home Technologies does not recommend
adhesive based vinyl flooring due to thermal expan-
sion. Floating-style flooring can be used, but will reach
temperatures up to 110°F in a room with ambient tem-
peratures of 70°F. Consult flooring specifications to
ensure compatibility.
Protective
Metal Hearth
Strip
2 in. (51 mm)
required
Heat & Glo • EM-415, EM-485T Installers Manual • 4017-268 • Rev S • 01/22
Note: Maximum height from floor
under fireplace to top of finished
hearth extension is 2 in. (51 mm).
Noncombustible
Finishing Material
16 in. (EM-415)
20 in. (EM-485T) Min.
Hearth Extension
Noncombustible
Framing Material
1/2 in. Micore
or equivalent
insulation
Figure 7.5
Hearth Extension Detail
Floor
Protective Metal
Hearth Strips
29
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