The Ontario Building Code | Protection Against Chemical Attack
4.2.3.6. Protection Against Chemical Attack
(1) Where concrete in foundations may be subject to chemical attack, it shall be treated in conformance with the requirements in CSA A23.1, "Concrete Materials and Methods of Concrete Construction".
In Plain Language
Where foundation concrete could be exposed to chemical attack, such as from sulphate-rich soils, it must be treated in conformance with the referenced protective measures to prevent premature deterioration.
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.