(1) Except in rubble stone wall, the vertical joints in successive courses in masonry walls shall break joint to the extent of at least a quarter of the length of a building-unit.

(2) Whenever the thickness of a solid wall of bricks or blocks is composed of more than one building-unit, either wall ties shall be built into such a wall to bond it together or a bond shall be
employed which provided a complete course of headers evenly distributed over the face area of the wall.

(3) The clear distance between any header or tie and its nearest neighbor in any direction in any direction shall not exceed the following value-

a) for bricks-

i) 450 millimeters, measured vertically; or

ii) 900 millimeters, measured horizontally;

b) for blocks-

i) 600 millimeters, measured vertically; or

ii) 900 millimeters, measured horizontally.

(4) Where wall-ties are employed to bond together the leaves of a wall, both the ties and their spacing shall comply with the requirements of section 33, whether the leaves are separated by a cavity or not.

(5) Bond-stones.- In walls built of natural stone, bond-stones shall be evenly distributed over the face areas of the wall, and shall be provided on both sides to such an extent that the area of the bond-stones on each side, measured in the plane of the wall, is not less than one-sixth of the face area of the wall.

(6) The bond-stones referred to in subsection (5) shall, in the case of rubble stone walls, which are not retaining-walls, be built into the thickness of the wall to a depth of not less than 320 millimeters or the thickness of the wall, whichever is less, and, in the case of rubble stone retaining-walls, the bond-stones shall extend far enough from each face into the thickness of the wall to overlap the adjacent bond-stones extending from the opposite face by not less than 100 millimeters.

(7) In the case of ashlar masonry walls, bond-stones shall extend throughout the full thickness of the wall.

(8) The maximum distance between adjacent bond-stones on the same side of the wall, center to center, in both the horizontal direction and the vertical stone walls not more than 600 millimeters thick and 750 millimeters for rubble stones walls thicker than 600 millimeters.

(9) Walls shall be properly bonded by a masonry bond to piers and buttress, and, except where walls are bonded to cross-walls by anchors in accordance with section 19, to cross walls.