(1) Every empirically constructed no-fines concrete bearing-wall shall comply with the requirements of the following subsections.

(2) Its thickness shall be as set out in Table XVI, except that, where it employs, light-mass aggregate and supports a flat, heavy roof, it shall be at least 50 millimetres greater in thickness than set out in Table XVI .

TABLE XVI
MINIMUM THICKNESS OF EMPIRICALLY CONSTRUCTED NO-FINES CONCRETE BEARING-WALLS

(3) Such wall shall not be used in a storey other than those described in Table XVI.

(4) Where such wall is 200 millimetres or more in thickness, it shall have a storey height not exceeding 3,6 metres, and, where it is less than 200 millimetres in thickness, it shall have a storey height not exceeding 2,7 metres.

(5) Sections of wall between openings shall be not less in width than 450 millimetres, unless bridged over by a lintel as required by sections 17 and 18.

(6) Reinforcement shall be provided around openings as prescribed for walls of normal concrete, except that horizontal reinforcement shall be provided over each opening, as follows-

a) for a clear span exceeding 1,5 metres , a lintel of normal reinforced concrete, designed as such;

b) for a clear span of 1,5 metres or less, a lintel of reinforced no-fines or normal concrete:

Provided that a no-fines concrete lintel shall be not less than 300 millimetres in depth, and shall be reinforced with two 12 millimetre diameter steel bar or reinforcement of equivalent cross-sectional area.