All chimneys shall be built of brick, cinder
blocks, stone or reinforced concrete, the walls of which shall not
be less than 3 3/4 inches thick and shall have terra cotta flue linings.
Chimneys shall extend at least two feet above the highest ridge. Chimneys
shall be built upon concrete or solid masonry foundations. The footing
for an exterior chimney shall start below the frost line. Listed factory-built
chimneys shall be installed in accordance with the term of their listings
and the manufacturer's instructions.
A.
The back and sides of fireplaces hereafter erected
shall be of approved masonry or reinforced concrete of not less than
four inches total thickness and shall include a lining of fire brick
or other approved material of not less than two inches in thickness.
B.
Wooden centers, used in the construction of that part
of the supporting arch which is below the hearth of the fireplace
inside of the chimney breast, shall be removed when the construction
of the arch is completed and before plastering is started on the underside.
A.
Every smoke pipe shall connect with a chimney or other
approved flue and shall enter a chimney through a fireclay or metal
thimble or flue ring of masonry. No smoke pipe shall pass through
a floor nor through a roof.
B.
Smoke pipes shall not pass through combustible partitions,
provided that smoke pipes from ordinary ranges and stoves may pass
through combustible partitions if they are guarded by double metal
ventilating thimbles two inches larger in diameter than the pipe or
by steel tubes built in brickwork or other approved fireproofing materials
extending not less than eight inches beyond all sides of the tube.
