Sec. 494(33). Chimneys and fireplaces.
(a) Except as herein provided all chimneys in every building
hereafter erected, and all chimneys hereafter altered or rebuilt
shall be constructed of brick, stone, or concrete. No masonry
chimney shall have walls less than eight (8) inches thick unless
it be lined on the inside with well-burned terra cotta or fire clay
chimney tile set in Portland Cement Mortar in which case the
wall shall be not less than four (4) inches thick. The lining
shall be continuous from the bottom of the flue to its extreme
height. In concrete chimney an air space of not less than 1 inch
shall be left between the concrete and flue lining.
(b) No chimney shall be corbeled out more than eight (8)
inches from a brick wall, and such corbeling shall consist of at
least five courses of brick.
(c) All chimneys shall be capped with terra cotta, brick, stone,
concrete or cast iron.
(d) The smoke flue of every high pressure steam boiler and
every appliance producing a corresponding temperature in a flue,
if built of brick, stone, reinforced concrete or other approved
masonry, shall have walls not less than twelve (12) inches thick,
and the inside four (4) inches of such walls shall be fire brick,
laid in fire clay mortar, for a distance of at least twenty-five (25)
feet from the point where the smoke connection of the boiler enters
the flue.
(e) The top of, or any openings in, a chimney shall be at
least three feet above the nearest partition of the roof.
(f) No chimney in any building shall have wooden supports
of any kind. Supports shall be incombustible and shall rest upon
the ground of the foundation, on approved mortar stumps.
(g) All chimneys which are dangerous from any cause shall
be repaired and made safe or taken down.
(h) Metal smoke stacks may be permitted for boilers, furnaces,
and similar apparatus where large hot fires are used, provided
they may have a clearance from all combustible material
of not less than one-half the diameter of the stack, but not less
than fifteen (15) inches unless the combustible material be properly
guarded by loose-fitting metal shields, in which case the distance
shall not be less than 12 inches. Where such stack passes
through a roof, it shall be guarded by a galvanized iron ventilating
thimble extending from at least nine (9) inches below the
under side of the ceiling or roof beams, to at least nine (9)
inches above the roof, and the diameter of the ventilating thimble
shall be not less than thirty-six (36) inches greater than that
of the smoke stack.
(i) The fireback of every fireplace hereafter erected shall be
not less than eight (8) inches in thickness of solid brickwork,
nor less than twelve (12) inches of stone lined with firebrick.
When a grate is set in a fireplace a lining of firebrick at least
two (2) inches in thickness shall be added to the fireback; soapstone,
tile or cast iron may be used, if solidly backed with brick
or concrete.
(j) The walls of all incinerators connected with buildings
shall be not less than eight (8) inches thick, the inside four (4)
inches of which shall be constructed of standard well burned
firebrick.
(k) All flue holes when not in use shall be closed with tight-fitting
metal covers.
