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to the height of at least four feet from the floor level, and the thickness of such material shall not be less than half an inch.
of extent of
houses.
65. No kitchen of any tenement house shall, without the Limitation permission of the Building Authority as signified by the ap- kitchens in proval of the plan required under the provisions of this Ordin- tenement ance, hereafter be constructed so as to extend across more than one-half of the width of such building if such building has other buildings abutting against it on both sides or is separated from any adjacent building or from land on which any building may be erected by a less space than twenty feet throughout one side. The width of a building shall be measured parallel to the principal front and shall be the average distance between the centres of the party walls or the outer faces of the lateral external walls of such building.
or fire-
66. Every fireplace shall be constructed with a proper Construction chimney or smoke-flue and in such a manner as not to allow of chimneys the smoke to escape through any window or hole in the walls places. or roof or through any vent other than such chimney or smoke- flue. The interior surfaces of every brick or masonry chim- ney or smoke-flue shall be smoothly rendered with mortar, or lined with earthenware pipes and no such chimney or smoke- flue shall have less than twenty-eight square inches of internal sectional area, equivalent to a diameter of six inches in the case of circular pipes, unless with the approval of the Building Authority. Except when required for heating purposes, smoke-flues shall be encased with brickwork properly bonded into the wall in connexion with which they are constructed, and, when added to existing buildings, such brickwork shall be built in cement-mortar :
Provided that in the case of chimneys or smoke-flues re- quiring to be extended to a greater height than five feet above the roof, any extension in excess of that height may, at the discretion of the Building Authority, consist of iron pipes.
use of
67. Whenever any fireplace is adapted for the use of Fireplaces charcoal or wood as fuel, such fireplace shall be provided with adapted for a hood of sheet-metal or other approved material of sufficient charcoal or size connecting with a chimney or smoke-flue carried up above the level of the main roof.
wood to have hoods.
stove, or
to be incom-
68. The upper surface of any floor under any oven, Floors stove or fireplace shall be of incombustible materials, extend- under oven, ing over the whole area covered by such oven, stove or fire- fireplace place and beyond to a distance of nine inches at least on every bustible. side of such oven, stove or fireplace; and such floor shall have hearths of stone, tile or other incombustible material laid before every chimney-opening.
fixed near
69. No chimney or smoke-flue shall be constructed or Chimneys fixed nearer than nine inches to any wood-work or combustible not to be material unless encased in non-conducting and incombustible wood-work. material to the satisfaction of the Building Authority.
70. Every brick or masonry chimney or smoke-flue shall Thickness be continued up above the roof in brick or cut stone-work, of and height a thickness all round of not less than four inches, to a height above roof. of chimney of not less than three feet above the highest point in the line of junction with such roof; and every such chimney or smoke flue hereafter erected above such point shall be built in cement
mortar.