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gypS\1lll wall board and with gypSUlll plaster filling at intersecti;: O~!lllS and of walls with ceilings and floors. Metal lath and gypsum plaster or gypsum lath and ibibaster will be acceptable.. Openings from the building into garage shall be restricted to a single door- way; such opening shall be provided with a metal, metal covered or solid wooden door of not less thqn one and three-fourths (1-3/4) inches nominal thickness equipped with an approved self-closing device. Where the garage is connected to the building proper by a stairway, such stairway shall be enclosed. The enclosure shall have a fire resistance rating of at least one (1) hour. Floors shall be without pits or depressions. 6-35 The walls of chimneys used for stoves, ranges, fire-places, heating furnaces or other heating appliances regardless of the type of fuel to be used, shall be built of brick, concrete, stone or hailow tile of such thickness and construction as is hereafter specified. 6-36 All chimneys, irrespective of which materials the walls are built, shall have a nue of not less than eight (8) inches by eight (8) inches. Where coal is to be used for heating purposes, the nue shall be not less than eight (8) inches by twelve (12) inches. All flues to!',e set with acid resistant mortar. 6-31 Solid brick or concrete chimneys shall not be less than four (4) inches thick exclusive of flue lining. A standard size brick laid flatwise shall be deemed to fulfill this requirement for brick chinmeys. 6-38, Hollow tile chimneys shall have a minumum thickness of 'ight (8) inches. 6-39 Hollow tile may be used in the construction of a chimney only where said chimney is part of an exterior tile wall. 6-40 Chimneys shall extend at least three (3) feet above the highest point where they pass through the roof of a building and at least two ( 2) feet higher than any fidge within ten (10) feet of such ehimney. 6-41 Chimneys shall be properly cast with brick, terra cotta, stone, east iron, concrete or other approved non-combustible weather proofed materia18 6-42 Chimneys shall be wholly supported on masonry or self supporting fire pjroof construction. 6-43 ,Foundations of an ezterior chimney shall start telow the frost line. 6-44 No chimney shall be corbeled from a wall more than six (6) inches; nor shall a chimney be corbeled from a wall which is leGS than twelve (12) inches in thickness unless it projects equally on each side of the wall: provided that in the second story of two (2) story dwellings the corbeling of chimneys on the exterior of the enclosing walls may equal the wall thickness. In every case, the corbeling shall not exceed one (1) inch projection for each coarse of brick protected. 6-45 No change in the size or shape of chimney where the chimney passes through the roof shall be made within a distance of six (6) inches above or below the roof joisj or rafters. -29- ------~ -- --- - ---- ~---