(1) All buildings composed of masonry construction, and all masonry and concrete walls, shall be erected in accordance with the provisions of this section.

(2) All materials and building-units shall comply with the requirements of section 5.

(3) The construction shall be executed in accordance with the general requirements of sections 6 to 38, and, in addition, every part of the construction shall be constructed either-

a) in accordance with the general requirements for empirical construction set out in sections 39 to 43, and the particular requirements for empirical construction set out in sections 44 to 62, applicable to the building-units or materials used; or

b) in accordance with the provisions of sections 63 to 82 for the calculated designed masonry construction:

Provided that-

i) where no calculations are submitted for approval in connexion with the design of any masonry building, or any particular portion of such building, it shall be assumed that such building or portion is intended to comply with the requirements for empirical construction set out in 39 to 62; and

ii) the local authority shall be entitled to require that-

A. walls and piers which support any cantilevered load other than the loads from lintels or from timber floor-joints or ceiling-joists, or from timber rafters or trusses; and

B. any portion of the building which the local authority considers would otherwise be dangerous;

shall either be designed in accordance with the provisions of sections 63 to 82 for the calculated design of masonry construction or be constructed of other materials in accordance with these by-laws.

(4) All walling of materials other than masonry or concrete shall comply with the requirements sect out in section 7 for unspecified materials’