(1) an existing masonry wall, pier or column may be used in the construction of a building, and in the repair, alteration or enlargement of a building, if it complies with the requirements of these by-laws.

(2) an existing masonry wall which is structurally sound which is of insufficient thickness for its proposed use may be made thicker by the addition of material similar to that of the existing wall, laid in mortar of the required proportions, if the foundations for the completed structure comply with these by-laws.

(3) The additions or linings referred to in subsection(2) shall be thoroughly bonded to the existing masonry by toothings bonded 100 millimeters deep or the full thickness of the lining. Whichever is lesser, into the new masonry, and at least 100 millimeters into the existing masonry.

(4) The toothings referred to in subsection (3) shall be distributed uniformly throughout the area of the additions to the wall, and shall have an aggregate vertical cross-sectional area not less than 15 per centum of the total area of that part of the wall thickened by lining.

(5) Plaster, or adherent coatings which might impair the adhesion shall be stripped off any wall-surface against which a lining is to be built, and the whole of such masonry surface shall be created before the construction of the lining is commenced.