7.3.4.6.Support for Underground Horizontal Piping

(1) Except as provided in Sentence (2), nominally horizontal piping that is underground shall be supported on a base
  that is firm and continuous under the whole of the pipe. (See Note A-7.3.4.6.(1))

  (2) Nominally horizontal piping installed underground that is not supported as described in Sentence (1) may be
  installed using hangers fixed to a foundation or structural slab provided that the hangers are capable of
  (a) keeping the pipe in alignment, and
  (b) supporting the weight of
           (i) the pipe,
          (ii) its contents, and
         (iii) the fill over 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.