7.3.5.1.Protection of Piping

(1) Where piping is installed underground, the backfill shall be carefully placed and tamped to a height of 300 mm over
  the top of the pipe and shall be free of stones, boulders, cinders and frozen earth. (See Note A-7.3.5.1.(1))

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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.