FLOOR PROTECTION
If this fireplace is installed on a combustible floor, the floor area 20 inches in front of, and 12 inches either side of the fireplace opening must be protected by an insulating noncombustible hearth extension. This hearth extension may be either minimum
The H2068 hearth extension kit consists of sufficient insulation board to cover the 20" x 68" floor area with ˚ inch layer of insulation. A 20" x 68" 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 H2068 hearth extension has a thermal conductivity (K factor) of 0.43. If you do construct a hearth extension equivalent to the H2068, 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 1/2" covering provided by the H2068.
FIGURE 11
SB5400SS
FIREPLACE
HEARTH
12" 
(MIN.) 
SAFETY STRIP IS REQUIRED WHEN
UNIT IS PLACED ON A COMBUSTIBLE FLOOR OR PLATFORM.
12" |
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(MIN) |
| |
20" |
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(MIN) | ALTERNATE BRICK OR STONE | |
| HEARTH EXTENSIONS FOR USE | |
| WITH THE SB5400SS FIREPLACE | |
| WHEN PLACED OVER A COM- | |
6" | BUSTIBLE FLOOR WITHOUT | |
INSULATION BOARD PROTECTION | ||
(MIN) |
BRICK OR STONE HEARTH
EXTENSION - 68" LONG MIN.
FIREPLACE AND HEARTH EXTENSION AND TOP VIEW
FIGURE 12
12" | 12" |
H2068 HEARTH EXTENSION | 20" | ||
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OR EQUIVALENT |
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68"
NOTE: A hearth extension placed on a combustible floor must be constructed with rigid insulation which has a minimum "R" value of 1.16 or a "K" value of
0.43.The insulation must be covered with a
SB5400SS MINIMUM HEARTH EXTENSION DIMENSIONS
10
53D9028. Rev 1 03/03