(1) Reinforcement, mixing and placing of reinforced-concrete walls.- Reinforcingof concrete walls shall be carried out, and the concrete shall be mixed and placed, in accordance with the requirements of Chapter 3

(2) Design and thickness of reinforced-concrete walls.-Reinforced-concrete walls shall be designed and constructed in accordance with the provisions of Chapter 3, and shall in all cases be of the following minimum thickness-

a) basement-walls and foundation-walls, 150 millimetres;

b) exterior and interior bearing-walls, 100 millimetres.

(3) The thickness of the leaves of cavity-walls shall not be less than that of brick walls under the same conditions:

Provided that-

i) where 100-millimetre thickness is required for brickwork, 75 millimetres may be used for reinforced concrete;

ii) in dwelling-houses of a height not exceeding two storeys or 7,5 metres, whichever is the lesser, leaves or cavity-walls may be less than 75 millimetres in thickness, bust shall be not less than 40 millimetres in thickness for an unsupported length not exceeding 24 times the effective thickness;

iii) in single-storey dwelling-houses, leaves of cavity-walls shall be not less than 50 millimetres in thickness for an unsupported length exceeding 24 times but not exceeding 40 times the effective thickness.

(4) Reinforced-concrete columns.- Reinforced-concrete columns shall de designed in accordance with the provisions of Chapter 3.