390
Construc-
tion of walls regulated.
Thickness
of external and party walls.
6
Walls.
10. Every wall shall be constructed of brick, stone or other hard incombustible substance, solid
across
its entire thickness and shall be properly bonded and substantially put together with good cement or lime mortar to the satisfaction of the Build- ing Authority. Except where specially permitted in this Ordinance, no part of such wall shall be thicker than any part underneath it, and all cross walls and return walls shall be properly bonded into main walls. Sound blue bricks may be used in the walls of the uppermost storey only of a building, or, where such storey exceeds fifteen feet in height, in the uppermost fifteen feet of the walls of such storey: but blue bricks, may not, without the approval of the Building Authority, be used in the walls of the other storey or storeys.
11. (1) Every person who erects a new building shall construct every external and every party wall of such building not exceeding thirty-five feet in length, clear of cross walls, in accordance with the following rules, and in every case the thickness prescribed shall be the minimum thickness of which such wall may be constructed :—
(a) Where the wall does not exceed 12 feet in height, it shall be 9 inches thick for its whole height.
(b) Where the wall exceeds 12 feet but does not exceed 25 feet in height, it shall be 184 inches thick for its whole height.
(c) Where the wall exceeds 25 feet but does not exceed 40 feet in height, the wall in the lowermost storey, and in any space underneath such storey, shall be 18 inches thick, and in the other storey or storeya 13 inches thick.
(d) Where the wall exceeds 40 feet but does not exceed 55 feet in height, the wall in the lowermost storey, and in any space under- neath such storey, shall be 22 inches thick, the wall in the next storey 18 inches thick, and in the other storey or storeys 13 inches thick.
(e) Where the wall exceeds 55 feet but does not exceed 70 feet in height, the wall in the lowermost storey, and in any space under- neath such storey, shall be 27 inches thick, the wall in the next storey 22 inches thick, the wall in the next storey 18 inches thick, and in the other storey or storeys 13 inches thick,
(f) Where the wall exceeds 70 feet but does not exceed 80 feet in beight, the wall in the lowermost storey, and in any space under- neath such storey, shall be 31 inches thick, the wall in the next storey 27 inches thick, the wall in the next storey 22 inches thick, the wall in the next storey 18 inches thick, and in the other storey or storeys 13 inches thick.
Provided that—
(i) in cases where the number of storeys is less than that indicated in the foregoing rules or where the walls are constructed in good cement mortar, the respective thicknesses of the walls shall be determined by the Building Authority:
() in the case of two-storied buildings and of the uppermost two storeys of buildings containing a greater number of storeys, the walls may be 131 inches thick throughout the height of such storeys, provided such height does not exceed 25 feet;
two
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(iii) no storey shall exceed in height 15 feet without the permission of the Building Authority, who shall in such case prescribe to what extent, if any, the walls shall be increased in thickness. Such increase of thickness may be provided for by piers, of the required thickness and of such collective length, not exceeding one-fourth part of the length of the walls, as the Building Authority may require.
(2) If any wall exceeds 35 feet but does not exceed
60 feet in length clear of cross walls, the thickness of such wall shall, unless the Building Authority other- wise permits, be increased by adding 4 inches to the thickness specified in sub-section (1).
12. The provisions of section 11 shall also apply, in Sec. 11 to the case of existing buildings, to any wall or portions apply to of walls hereafter erected or re-erected therein: walls here- Provided that in any case where from any cause it is not practicable to apply such provisions, the thick. nesses shall be determined by the Building Authority.
after erected or l'e-erected,
13. (1) No wall, other than a boundary wall, shall Limitation exceed sixty feet in length, clear of any return or of length cross wall, without the approval of the Building of walls. Authority.
A wall shall not be deemed a cross wall for the Cross purpose of determining the length of any external or walls. party wall unless it is carried up to the top of the topmost storey, and unless in each storey the aggregate extent of the vertical faces or elevations of all the recesses and that of all the openings therein taken together shall not exceed one-half of the whole extent of the vertical face or elevation of the wall in such storey.
(2) No wall shall exceed eighty feet in height Walls without the approval of the Building Authority. The over 80 feet height of every wall shall be measured from the level in height
to be of the adjacent foot-path, or where no foot-path exists. from the level of the street or ground outside, to the Building
approved by highest part of such wall or, in the case of a gable, Authority. to half the height of such gable, but shall in no case Measurement include any portion of a wall which acts as a retaining of walls.
of height wali Ornamental towers, turrets, or other architec- tural features or decorations, not exceeding nine feet in height and parapets not exceeding three feet in height shall not be included in measuring the height
of such wall.
than-35 feet
(3) Any external wall of a building exceeding thirty- Tie-rods five feet in length, clear of cross walls, shall be secured required for ut the level of each upper floor, and at the ceiling or external roof, with wrought-iron tie-rods not less than one and walls more a quarter inches in diameter, spaced not more than in length. twelve feet apart and extending through such external wall and the nearest parallel wall of such building. The tie-rods shall have screwed ends with nuts bearing upon wrought-iron washer plates not less than eighteen inches square by half an inch in thickness, or cast- iron washer plates to be approved by the Building Authority, and the brickwork of each wall for its full thickness and for an area of two feet square round the end of each tie-rod shall be built in cement- mortar :
Provided that the Building Authority may modify or dispense with the requirements of this sub-section whenever he may consider such requirements un- necessary.
14. The thickness of every cross wall shall be at Thickness least two-thirds of the thickness prescribed by section of cross 11 in that behalf for an external wall or party wall walls to be of the same height and length and belonging to the that of same class of building as that to which such cross wall main walls.
two-thirds
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