Construction of boundary or enclosure walls.
Party walls
to be carried up above
roof.
Openings through
party or external
walls.
Recesses.
Returns to shop fronts.
1050
Every retaining wall shall be provided with a proper cop- ing of cement concrete or other impervious material approved by the Building Authority and adequate channels shall be formed at the top and toe of every such wall to intercept and carry off stormwater.
The design of every retaining wall, breast wall, dam or similar structure shall be subject to the approval of the Building Authority to whom a stress diagram of the wall must be sub- mitted.
25. No person shall construct or reconstruct any bound- ary wall or enclosure wall fronting any public road or thoroughfare unless it is solid throughout its entire thickness and built of brick or stone properly bedded and bonded together, surmounted by a coping of dressed stone or properly moulded bricks set in cement mortar or constructed of such other materials as may be approved by the Building Authority.
26. Every party wall shall unless exempted by the Build- ing Authority be carried up above the upper surface of the roof of every building to a height of at least eighteen inches, measured at right angles to the slope of the roof, and every such party wall and every parapet wall shall be properly coped with a coping composed of cement and sand in the proportion of not less than one part of cement to every two parts of sand, or of such other material as the Building Authority may approve, or shall be otherwise protected in order to prevent water soaking into such wall.
27.-(1) Openings may only be made in party walls to an extent not exceeding one half of their area on each storey unless in the opinion of the Building Authority a greater area may be allowed,
(2) When it is desired to close any openings previously made through any party wall, such openings shall be solidly stopped up with brick or stone-work of the full thickness of the party wall, and such brick or stone-work shall be built in lime-mortar or cement-mortar and properly bonded with such party wall. Any future openings through any such party wall shall be restricted to the removal, in whole or in part, of such stoppings, unless the previous openings did not extend to one half of the area of such wall, and additional openings shall only be made in such manner as to ensure that the total extent of the openings, inclusive of those previously made, shall not ex- ceed one half of the area of such wall on each storey.
(3) Recesses may be made in party walls and in external walls: Provided that the aggregate area of such recesses does not exceed one-half the whole area of the wall of the storey in which they are made, and that the backs of such recesses are of not less thickness than thirteen inches in party walls, and nine inches in external walls.
(4) In the case of a shop front left open to the street, the side walls or party walls shall be returned along such front for at least twelve inches where the house has more, and for at least nine inches where the house has not more, than one storey above the ground storey, and such return walls shall be properly bonded into the side walls or party walls in cement mortar. Where such shop front is in a corner building, the side wall shall be returned along such front for at least two feet.
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