(1) Empirically constructed brick curtain-walls shall-

a)have a thickness which is –

i) not less than 215 millimetres; and

ii) uniform throughout the height of the wall in any one storey; and

b)nor exceed a height of-

i) 5,4 metres in any one storey; or

ii) a total of 18, 3 metres when laid in class A, B or C mortar; or

iii) a total of 7,2 metres when laid in class D mortar

(2) Empirically constructed solid brick or cavity brick panel-walls have an effective thickness of not less than 100 millimetres.

(3) The effective thickness of faced panel-walls shall include brickwork and facing, but that of veneered panel-walls shall exclude the veneer.

(4) walls constructed as panel-walls shall sustain no forces other than their own mass and wind forces unless such other forces are approved by the local authority.

(5) Panel-walls which contain openings shall be fixed along their tops in the manner specified in section 31, and the curves designated in Figure 1 as “top fixed” refer to panel-walls so fixed.

(6) The length and height of any panel-wall shall not exceed the values corresponding to any point on the appropriate curve in Figure 1 for the relevant condition of the top of the panel-wall and its thickness.