4.2.4.4.Depth of Foundations

(1) Except as permitted in Sentence (2), the bearing surface of a foundation shall be below the level of potential
     damage, including damage resulting from frost action, and the foundation shall be designed to prevent damage resulting
     from adfreezing and frost jacking. (See Note A-4.2.4.4.(1))

     (2) The bearing surface of a foundation need not be below the level of potential damage from frost where the
     foundation
     (a) is designed against frost action, or
     (b) overlies material not susceptible to frost action.

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.