The Ontario Building Code | Structural
11.4.3.2. Structural
(1) Where the performance level of an existing buildingis reduced under Sentence 11.4.2.1.(1),
(a) remedial measures shall be taken to support the proposed loads, or
(b) the portion of the floor affected by the proposed loads shall be restricted to the loading it will support and signs stating the restrictions shall be posted.
In Plain Language
Where a renovation reduces a building's structural performance level, either remedial measures must support the proposed new loads, or the affected floor area must be load-restricted with posted signage warning of the limit, as set out in this article.
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.