7.3.4.7.Support for Vent Pipe Above a Roof

(1) Where a vent pipe that may be subject to misalignment terminates above the surface of a roof, it shall be supported
  or braced. (See Article 7.5.6.5. for location of vent pipe terminals.)

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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.