(1) For empirically constructed solid-brick bearing walls, the total height of the wall, including the height of the foundation-wall, shall not exceed the following, when laid in class A, B or C mortar-

a) for single-storey buildings, 5,4 metres;

b) for two-storey building, 9 metres;

c) for three-storey buildings, 12 metres;

d) for four-storey buildings, 15 metres.

(2) When such walls are laid in class D mortar, such maximum height shall not exceed 5,4 metres.

(3) In buildings which have more than four storeys, or walls higher than 15 metres, the walls shall be designed in accordance with requirements of section 63 to 82.

TABLE X
PERMISSIBLE DIMENSIONS FOR EMPIRICALLY CONSTRUCTED BRICK BEARING-WALLS LAID IN CLASS D MORTAR*

*Class D mortar may be used in bearing-walls only in buildings or the topmost storey of a building.
†See definition of “restrained”, “a fully restrained at the top” and “a wall moderately restrained at the top”.
Joisted timber floors and precast concrete floors not anchored in accordance with section 25 shall be regarded as giving no lateral restraint to the walls supporting them.