Floor Protection - MHSC SB38 Installation, Operation And Maintenance Manual

floor protectioN

If this fireplace is installed on a combustible floor, the floor area 0 inches in front of, and 1 inches
either side of the fireplace opening must be protected by an insulating noncombustible hearth exten-
sion. This hearth extension may be either minimum 6-inch thick stone or brick as shown by Figure
13, an H066 hearth extension kit or a locally constructed equivalent to the H066.
The H066 hearth extension kit consists of sufficient insulation board to cover the floor area with
1/" inch layer of insulation. A piece of galvanized steel is included in the kit to cover the insulation
before a finishing layer of noncombustible material of stone, brick, tile, etc., is applied to finish the
hearth extension.
The insulation used in the H066 hearth extension has a thermal conductivity (K factor) of 0.43. If
you do construct a hearth extension equivalent to the H066, be sure the insulation you use has
enough compressive strength to support the weight of the covering materials and persons standing
on it, and insulating qualities equal to or better than the 1/" covering provided by the H066.
Figure 13
Hearth
12"
Min.
Safety Strip is Re-
quired When Unit
is Placed on a
Combustible Floor
or Platform
Figure 15
top view
fireplace and hearth
extension
87D0057
Alternate brick or stone hearth
extensions for use with the SB38/
SB44
placed over a combustible floor
without insulation board protec-
tion.
12"
Min.
Brick or Stone Hearth Extension
- SB38/38HB 6" Long Min.
- SB44/44HB 68" Long Min.
FP38
FP2238
SB5400 dec hearth
12"
SB38/38HB - 6" Min.
SB44/44HB - 68" Min.
Minimum Hearth Extension Dimensions
FP2239
SB5400
hearth protection
SB38 / SB44 Series Woodburning Fireplace
Series fireplace when
20" Min.
6" Min.
FP39
12"
Screened Opening
cautioN: Do not
place finishing materials
beyond these edges or
cover air inlets
cautioN:
only brick or other noncombustible materials
may be placed in front of, or in contact with
the black face of the fireplace.
Figure 14
FP1168
finishing front
12/20/01 djt
Note: A hearth extension placed on a
combustible floor must be constructed
with rigid insulation which has a mini-
mum "R" value of 1.16 or a "K" value of
0.43. The insulation must be covered
with a noncombustible covering such as
a tile, stone, marble, or a piece of 0.018
minimum sheet metal which is needed
20"
to protect the insulation. Follow instruc-
tions provided with the for all other
specifications and directions for proper
installation of the fireplace and hearth
extension.
Screen
Rail
Hearth
FP1168
13