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9
A chimney inside the house must have at least 2"
(50mm) of clearance to the combustible structure.
A chimney outside the house must have at least 1"
(25mm) clearance to the combustible structure.
Firestops must be installed in the spaces where
the chimney passes through floors and/or ceiling
(Figure 8).
FIGURE 8
Minimum 1
Clearance for
Exterior Chimney
to Sheathing
Remember that insulation must not contact the
chimney. There must be air space around the
chimney. Insulation must be 2" (50mm) or more from
the chimney (Figure 9).
A chimney must be the required height above the
roof or other obstruction for safety and proper draft
operation. The chimney must be a minimum of 3'
(914mm) higher than the highest point where it
passes through the roof, and at least 2' (610mm)
higher than the highest part of the roof or structure
that is within 10' (3048mm) of the chimney, mea-
sured horizontally (Figure 10).
FIGURE 9
Noncombustible
Fire-Stopping
Material
FIGURE 10