The Ontario Building Code | Adjustments to Footing Widths for Interior Walls
9.15.3.6. Adjustments to footing Widths for interior Walls
(1) The minimum strip footing widths for interior loadbearingmasonry walls shown in Table 9.15.3.4. shall be increased by 100 mm for each storey of masonry construction supported by the footing.
(2) footings for interior non-loadbearing masonry walls shall be not less than 200 mm wide for walls up to 5.5 m high and the width shall be increased by 100 mm for each additional 2.7 m of height.
In Plain Language
Footing widths for interior walls must be adjusted as set out in this article, since interior load-bearing walls can carry different loads than exterior walls.
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.