392
Thickness
walls.
8-
belongs, unless, in any particular case, the Building Authority shall specially authorise a less thickness. But if such cross wall supports a superincumbent external wall the whole of such cross wall shall be of the thickness prescribed for an external wall or party wall of the same height and length and belonging to the same class of building as that to which such cross wall belongs.
15. Partition walls not exceeding twelve feet in of partition height and the external walls of latrines, bathrooms and stair hoods not exceeding eight feet in height may be constructed of brick in cement-mortar of a thickness of four and a half inches, or of reinforced concrete or of such other material and of such thick- ness as the Building Authority may permit.
Damp-proof
courses to
be provided.
Construction
of founda- tions.
Retaining walls.
16. Every wall of every new building shall have a damp-proof course composed of materials impervious to moisture to be approved by the Building Authority extending throughout its whole thickness and at such level as the Building Authority may require.
Every external or enclosure wall which abuts against the earth shall be protected by a vertical damp-proof course set in a position satisfactory to the Building Authority.
17. The foundation of every wall of a building shall be of footings of sound stone, brick, concrete, or other equally hard substance, carried down to a depth of not less than twice the thickness of the wall in the lowest storey of the said building; and the lowest course of every such foundation shall be of a width of not less than twice the thickness of the wall in the said lowest storey, and the width of such foundation, shall diminish gradually towards the upper surface thereof in regular steps or offsets: Provided that on rock or hard ground of an incompressible nature, or in sandy, unstable or soft ground, the Building Authority may permit or require the foundations of all works and buildings to be of such special depth and width, and of such materials as shall be approved by him as being in each particular case applicable to such ground.
of
18. Retaining walls shall be constructed masonry, brickwork or cement concrete. Such walls when constructed of masonry or brickwork shall be properly bonded and built solid throughout in cement mortar or when built in masonry may be laid dry.
Every retaining wall shall be provided with one or more adequate foundation courses of cement concrete laid at right angles to the face of the wall on solid ground or piled and each course shall not be less than 12 inches in depth and shall project at least 6 inches beyond the face of such wall and shall extend the full thickness of such wall.
All masonry and brick walls exceeding 12 feet in height shall be provided with lacing or bond courses of good cement concrete at least one foot in depth extending throughout the full thickness of the wall. The lacing courses shall be thoroughly keyed into the wall on their upper and lower beds. The distance between the top of the foundation courses and the first of such lacing courses and the distance between any two adjacent lacing courses shall not exceed 6 feet measured vertically. In the case of a masonry wall the stones shall be roughly squared and have flat beds, and bond or header stones at least 2 feet 6 inches in length must be inserted in alternate courses and laid to break joint and there shall not be less than one such bond or header stone to every square yard of surface area of the wall. At the back of every retaining wall (except when such is con- structed in dry masonry) there shall be formed a
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