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USSC 5
FIGURE 4-
CHIMNEY HEIGHT REQUIREMENTS
A Chimney must be the required height above the roof
or other obstruction for safety and for proper draft op-
eration. The requirement is that the chimney must be at
least 3 feet higher than the highest point where it passes
through the roof and at least 2 feet higher than the high-
est part of the roof or structure that is within 10 feet of
the chimney, measured horizontally.
The above chimney heights are the minimum required
by codes for safety purposes to allow sparks existing in
chimney time to cool before they land on the roof. Addi-
tional height will generally increase draft, improve heater
operating characteristics and reduce back drafting and
puffing problems due to wind
A masonry chimney is shown above. However, height
requirements are the same for a metal prefabricated
chimney.
AT LEAST
3 FEET
AT LEAST
3 FEET
10 FEET
Minimum 2 Inch Clearance
From Combustible Material
and Insulation
Noncombustible
Fire-Stopping Material
FIGURE 3-
MASONRY CHIMNEY REQUIREMENTS
FIGURE 2-
MASONRY CHIMNEY REQUIREMENTS
FLOOR
MINMUM 2 INCH CLEARANCE
FOR INTERIOR CHIMNEY.
MINIMUM 1 INCH CLEARANCE
FOR EXTERIOR CHIMNEY TO
SHEATHING
FLOOR
(SECOND STORY)
CHIMNEY
CEILING
CAULKING
Ceiling
NONCOMBUSTIBLE
FIRE-STOPPING
MATERIAL