BIS Ultima - Hearth Extension and Framing

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3.4.2 Hearth Extension Requirements
The BIS ULTIMA™ fireplace may be installed directly on a combustible floor; however, the
combustible floor in front of the fireplace must be covered with a non-combustible material
(tile, marble, stone, etc.). The supplied safety metal strip must be positioned as follows : One
half under the front of the fireplace and the other half must extend on the floor over which
the hearth extension will be built (figure 5b).
* The safety metal strip must cover the entire width of the fireplace.
Figure 5a
Figure 5b
Elevated fireplaces (Figure 6)
Elevated fireplace installations require a special
‘Z’ metal safety strip (field provided), in place of
the safety metal strip shown on Figure 5b. The
safety strip should extend the full width of the
fireplace. When more than one safety strip is used
they must overlap by a minimum of 1″.
Hearth extension of an elevated fireplace must respect
the same minimal dimensions as a fireplace installed
directly on the floor (figure5a).
3.4.3 Framing, Facing and Mantel
The construction of the framing, facing, and mantel must be in accordance with the standards
and the following illustrations (figures 7 to 11):
A. Frame the fireplace using 2" x 3" or heavier lumber.
B. WARNING: Combustible materials cannot be used in the space directly above the
fireplace, except for the studs above the facade that support the facing and mantel. This
area must remain empty for a height of 6'8" (2032 mm)
measured from the base of the
appliance.
Floor
Hearth extension
Non
-combustible
material
Safety metal strip
The crack between the
fireplace and the hearth
extension must be
sealed with a non-
combustible material
such as sand-cement
grout
Figure 6
‘Z’ safety strip
Fireplace