The Ontario Building Code | Connection of Vents above Fixtures Served
7.5.6.4. Connection of vents above Fixtures Served
(1) Except for a wet vent, every vent pipe shall extend above the flood level rim of every fixture that it serves before being connected to another vent pipe.
(2) No vent pipe shall be connected in such a manner that a blockage in a soil or waste pipe would cause waste to drain through the vent pipe to the drainage system.
In Plain Language
Where a vent connects above the fixtures it serves, this article sets out the specific requirements for making that connection correctly.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.