7.3.5.1A.Protection of Non-Metallic Pipe

(1) Where vitrified clay is located less than 600 mm below a basement floor and the floor is constructed of other than
  75 mm or more of concrete, the pipe shall be protected by a 75 mm layer of concrete installed above the pipe.

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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.