Floor Protection - MHSC MPL11 Installation, Operation And Maintenance Manual

FLoor ProtectioN

If this fireplace is installed on a combustible floor, the floor area 16 inches in front of, and 8 inches ei-
ther side of the fireplace opening must be protected by an insulating noncombustible hearth extension.
Figures 6 & 7
With either type hearth extension minor shifting of the supporting floor or expansion and contraction
may eventually cause a crack to develop between the hearth extension and the face of the fireplace.
To help prevent the crack from developing, the hearth extension materials must be firmly fastened in
place. Wall ties should be screwed to the face of the fireplace and imbedded in the mortar joints of
brick, stone, or other non-combustible materials. The metal safety strip packed with the fireplace must
be placed beneath the fireplace and extended under the hearth extension or into a mortar joint of the
hearth extension as shown by Figure 8. In the event a crack does eventually develop, the metal safety
strip will serve as a barrier to prevent sparks or embers from falling from the fireplace onto combustible
flooring materials.
Note: If noncombustible hearth extension materials are to be
placed at or below the level of the bottom of the fireplace, insu-
lation board is not required.
If the fireplace is recessed into the floor or the hearth is elevat-
ed with combustible materials, an MHSC H1652 hearth exten-
sion kit or equivalent must be used for additional protection.
Figure 6
Hearth
Extension
Wall Shield
Installed Flush
with Wall
Board
(16" x 36" x
1/2" thick Non-
combustible
Board with 'R'
Factor of 43 or
Less)
Finished Combustible
Wall Clearance from
Fireplace Screen Open-
ing
Hearth
Extension
Figure 7
4"
Min.
87D0173
FP2350
8"
Glass
16"
1/2" Air Space
29"
Min.
8"
Glass
FP2349
fireplace location
Installation Minimums
with No Wall Shields
FP2350
36" Min.
Hearth
Extension
Wall Shield on top of
Wall Board
(Model WS or Equiva-
lent)
FP2349
Hearth
Extension
MPL11 Woodburning Fireplace
2"
2"
Figure 8
FP2183
2"
FP2183
safety strip
1/09
Metal Safety
Strip
(2 Required)
Special 'Z'
Metal Safety
Strip
(2 Required)
9