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9.2.3
Masonry Chimneys
The stove may also be connected to a masonry
chimney, provided the chimney complies with the
construction rules found in the building code enforced
locally. The chimney must have either a clay liner or
a suitably listed stainless steel liner. If the masonry
chimney has a square or rectangular liner that is
larger in cross-sectional area than a round 6" flue,
it should be relined with a suitably listed 6" stainless
steel liner. Do not downsize the flue to less than 6"
unless the venting system is straight and exceeds 25
feet in height. When passing through a combustible
wall, the use of an insulated listed thimble is required.
9.3
Minimum Chimney Height
The top of the chimney should be tall enough to be above the air turbulence caused when wind blows
against the house and its roof. The chimney must extend at least 3 ft. (1 m) above the highest point of
contact with the roof, and at least 2 ft. (60 cm) higher than any roof line or obstacle within a horizontal
distance of 10 ft. (3 m).
Figure 33: Flat roof
9.4
Chimney Location
Because the venting system is the engine that drives the wood heating system, it must have the
right characteristics. The signs of bad system design are cold back drafting when there is no fire
in the stove, slow kindling of new fires, and smoke roll-out when the door is opened for loading.
There are two guidelines to follow. First, the chimney should be installed up through the heated
space of the house, not outside up on the wall. Second, the chimney should ideally go through
the highest heated space of the building or near the highest heated space.
Installation and operation manual - Bistro woodburning cookstove
Figure 32: Masonry hearth installation
Figure 34: Sloping roof
Page 51
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