(1) Masonry parapet-walls shall be designed in accordance with the requirements of section 63 to 82, unless they are bonded into return walls bonded to the structural frame of the building, or are tied to reinforced-concrete or reinforced-brick columns, or bonded into reinforced-brick piers.

(2) Reinforced-concrete columns shall be constructed in accordance with the provisions of Chapter 3.

(3) Reinforced-brick columns and piers shall comply with the requirements of sections 75 to 82.

(4) The return walls, columns and piers referred to in subsection (1) shall be no farther apart, center to center, than-

a) 7,5 meters for parapet-walls 215 millimeters in thickness; or

b) 4,5 meters for parapet-walls 100 millimeters in thickness

(5) If masonry parapet-walls are constructed on a concrete slab, they shall be provided with expansion joists at distances apart not exceeding 7,5 meters, and if such walls are bonded to piers, the expansion joints shall bisect the piers.

(6) Empirically constructed parapet-walls shall be constructed in accordance with section 53, and, if such walls act as balustrades, they shall comply with the requirements of subsection (7).

(7) Masonry balustrade-walls shall be designed in accordance of sections 63 to 82, unless tied columns or bonded into return walls or piers, and shall be provided, where necessary, with expansion joints as required for parapet-walls by subsection (5):

Provided that the return walls, columns or piers shall be not farther apart than-

a) 6,6 meters for a wall 215 millimeters in thickness; or

b) 4,05 meters for a wall 100 millimeters in thickness;

and the expansion joints shall not be farther apart than 8,1 meters.

Attention is drawn to the requirements for balustrades in Chapters 11 and 12