(1) The provisions of this section shall apply in empirically constructed buildings of masonry.

(2) Suspended floors other than of timber, or structural units comprising such floors, shall not exceed in span the figure set out column 3 of Table V for the superimposed load per square metre
for which the floor is designed set out in column 2 of floors in such buildings shall not exceed 250 kilograms per square metre.

TABLE V
MAXIMUM WIDTH OF SUSPENDED FLOOR SLABS FOR EMPIRICAL CONSTRUCTION

(3) The span of roof-trusses or girders shall not exceed 12 metres and, where such exceeds 10, 5 metres, the mass of the roof-covering, together with the purlins and framing, shall not exceed 35 kilograms per square metre of the horizontal area.

(4) Roofs shall be so constructed that no horizontal or inclined force other than that due to wind force is transmitted to walls.

(5) No recess shall be cut or formed so as to occupy a horizontal length of wall between the two vertical lines drawn through the adjacent sides of any two adjacent openings greater than one quarter of the horizontal distance between such lines.

(6) No opening, and no chase or recess regarded as an opening in terms of subsection(2) of section 17, shall be made in any panel-wall unless such a panel-wall is fixed along its top in accordance with the requirements of section 52.

7Attention is drawn to the fact that the walls designed in accordance with sections 63 to 82 do not also have to comply with the requirements for empirically constructed walls included Tables V to XVI.