13
M
ANTEL
A wood mantel, if installed, must be at least 48"(1.2 m) above the base of the fireplace (see
Figure 7). There is no restriction regarding the length or the width of the mantel.
H
EARTH EXTENSION REQUIREMENTS
A non-combustible hearth extension must be built in front of the fireplace and extend out on both sides.
Hearth extensions must be constructed according to the following guidelines:
1.
A layer of sheet metal 0.018" (0.45 mm) thick or 3/8" (9 mm) thick millboard or any other material
(tiles, marble, granite) with equivalent heat resistance may be used.
Check
with the local building authorities
before installing to determine what other materials are acceptable in your area.
2.
The hearth extension should be secured to the floor. The gap between the fireplace and the hearth
extension must be sealed with non-combustible caulking or cement.
3.
On a raised base or raised hearth, a "Z" shape piece of metal must be fabricated to join the bottom of
the fireplace to the floor.
* The supplied metal safety strip must be positioned as follows: One half under the fireplace and the
other half must extend on the floor over which the hearth extension will be built (figure 7b). The
safety metal strip must cover the entire width of the fireplace.
E
LEVATED FIREPLACES
(
FIGURE
7
C
)
Elevated fireplace installations require a special ‘Z’
Metal safety strip (field provided), in place of the safety
metal strip shown on figure 7b. 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 inch.
Figure 7a
Figure 7b
Safety metal strip
Hearth extension
non-combustible
matreial
Floor
The crack between
the fireplace and the
hearth extension
must be sealed with
a non-combustible
material such as
sand-cement grout
Fireplace
Figure 7c
‘Z’ Safety strip
