PART 7 — PLUMBINGUpdated for the 2024 Ontario Building Code
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7.5.4.2.Vent Stacks
(1) Except as provided in Sentence (2), every stack that drains fixtures from more than 4 storeys containing plumbing
fixtures shall have a vent stack.
(2) A stack that serves as a wet vent does not require a vent stack.
(3) The vent stack required by Sentence (1) shall be connected to a vertical section of the stack at or immediately below
the lowest sanitary drainage pipe connected to the stack.
(4) Fixtures are permitted to be connected to a vent stack, provided
(a) the total hydraulic load of the connected fixtures does not exceed 8 fixture units,
(b) at least one fixture is connected to a vertical portion of the vent stack and upstream of any other fixtures,
(c) no other fixture is connected downstream of a water closet,
(d) all fixtures are located in the lowest storey served by the vent stack, and
(e) the section of the vent pipe that acts as a wet vent conforms to the requirements regarding wet vents.
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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.