4.2.5.8.Backfilling

(1) Where an excavation is backfilled, the backfill shall be placed so as to
     (a) provide lateral support to the soil adjacent to the excavation, and
     (b) prevent detrimental movements.

  (2) The material used as backfill or fill supporting a footing, foundation or a floor on grade shall be of a type that is not
  subject to detrimental volume change with changes in moisture content and temperature.

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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.