18
CLEARANCE TO COMBUSTIBLES
Failure to maintain stated minimum clearances may result in a fire or explosion, causing property damage, personal injury, or
loss of life.
FIGURE 2.3
1”
Do not pack required air spaces with
insulation or other materials. Using insulation
or other materials in required air spaces may
result in a fire or explosion, causing property
damage, personal injury, or loss of life.
NOTE
: “Combustibles” are defined as “normal construction materials” and are considered to be: wood framing materials, particle
board, mill board, plywood sub-flooring, plywood paneling, wood flooring, and drywall.
The fireplace must sit on a concrete pad or slab that is designed to bear the total weight of the fireplace and chimney. This pad
or slab should provide for the noncombustible hearth extension substrate needed to support the code required noncombustible
hearth extension finish materials.
A noncombustible hearth extension must extends 32” beyond the front of the firebox and 8” to either side when the hearth
extension is level with the floor of the fireplace (Figure 2.1). The hearth extension can be reduced to 20” only when the
hearth extension is raised 12” or more above the combustible floor in front of the 20” hearth extension (Figure 2.2). Approved
noncombustible materials include brick, tile, or stone that is properly supported, with no combustible material against the
underside.
Opening to Side wall
32”
Opening to Combustible Trim
12’
Opening to Combustible Mantle with 8”
Depth
16”
Noncombustible Flush
Hearth Extension
32” front, 8” each side
Noncombustible Raised (>12”)
Hearth Extension
20” front, 8” each side
Firebox and Smoke Chamber to
Combustibles or Framing
1”
Smoke Chamber to Front Wall and
Smoke Chamber Top to Wood Framing
1”
FIGURE 2.1
MANTLE
TRIM
FLUSH HEARTH EXTENSION
SIDEW
ALL
TILE/MARBLE
16”
32”
12”
32”
8”
MANTLE
TRIM
SIDEW
ALL
TILE/MARBLE
16”
32”
12”
20”
8”
12”
RAISED HEARTH EXTENSION
FIGURE 2.2
Содержание FIREROCK LINEAR
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