The Ontario Building Code | Full and Partial Loading
4.1.7.3. Full and Partial Loading
(1) buildings and structural members shall be capable of withstanding the effects of,
(a) the full wind loads acting along each of the two principal horizontal axes considered separately,
(b) the wind loads as described in Clause (a) but with 100% of the load removed from any portion of the area,
(c) the wind loads as described in Clause (a) but considered simultaneously at 75% of their full value, and
(d) the wind loads as described in Clause (c) but with 50% of these loads removed from any portion of the area.
In Plain Language
Buildings and structural members must be able to withstand full wind loads acting along each of the two principal horizontal directions, plus specific partial-loading combinations that can produce more critical torsional or asymmetric effects.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.