The Ontario Building Code | Bracing and Lateral Support
220.127.116.11. Bracing and Lateral support
(1) Except as provided in Sentence (2), each exterior wall in each storeyshall be braced with at least one diagonal brace conforming to Sentence (3).
(2) Bracing is not required where the walls,
(a) have an interior finish conforming to the requirements of Section 9.29., or
(b) where the walls are,
(i) clad with panel-type siding,
(ii) diagonally sheathed with lumber, or
(3) Where bracing is required, it shall,
(a) consist of not less than 19 mm by 89 mm wood members,
(b) be applied to the studs at an angle of approximately 45° to the horizontal, and
(c) extend the full height of the wall on each storey.