(1) The use of no-fines concrete for walling shall be subject to the requirements of the following subsections.
(2) No0-fines concrete shall be used only in the bearing-walls not exceeding two storeys in height, in which the superimposed loads on suspended floors do not exceed 250 kilograms per square metre or of dwelling-houses of not more than three storeys, and in panel-walls, partition-walls and wing-walls.
(3) No-fines concrete shall not be used in any foundation wall or basement-wall, and no-fines concrete walls shall not be veneered except in in accordance with S.A.B.S. 073
(4) Holes, chases and recesses shall all be formed during construction of the wall, and shall not be cut afterwards.
(5) All exteriors surfaces shall be rendered with rendering at least 12 millimetres thick, which shall be mixed in proportions specified for class B or class C mortar in subsection (7) of section 13, and weep-holes at least 10 millimetres in diameter shall be formed in such rendering just above the damp-proof course and not farther apart than 1,5 metres.
(6) The bearing-surfaces which are to support timber or steel joists or precast concrete beams or slabs shall be levelled off to a smooth surface with class A mortar of a thickness of not less than 20 millimetres at the thinnest point, and the joists, beams or slabs shall bear solidly on such mortar surface at all points of the bearing-area.
(7) All reinforcement-rods used in the walls shall first be derusted and all loose mill-scale removed, and then be protected against corrosion by a coating of cement slurry which shall be allowed to harden before the concrete is cast around the rods
(8) There shall be no raking construction joints in the walls.
(9) The concrete shall be mixed and placed as specified in Chapter 3:
Provided that the concrete shall not be vibrated , but shall be rodded sufficiently to place it in its correct position.
(10) Flues in no-fines concrete walling shall be surrounded by normal, plain concrete not less than 25 millimetres in thickness, and no fines concrete not less than 150 millimetres in thickness shall be placed around the normal concrete.