Thickness of Exterior Walls Masonry

    (1)  Masonry exterior walls, other than cavity walls, in 1 storey buildings and the top storeys of 2 and 3 storey buildings shall be not less than 140 mm thick provided the walls are not more than 2.8 m high at the eaves and 4.6 m high at the peaks of gable ends.

    (2)  The exterior walls of the bottom storeys of 2 storey buildings, and exterior walls of the bottom 2 storeys of 3 storey buildings shall be not less than 190 mm thick.

    (3)  In exterior walls composed of more than one wythe, each wythe shall be not less than 90 mm thick.

Article 9.20.6.1 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.