The Ontario Building Code | Cast Iron Drainage and Vent Pipe and Fittings
7.2.6.1. Cast Iron drainage and vent pipe and Fittings
(1) drainage piping, vent piping and fittings made of cast iron shall be certified to CAN/CSA-B70, "Cast Iron soil pipe, Fittings and Means of Joining".
(2) Cast iron soil pipe and fittings shall not be used in a water system.
In Plain Language
Cast iron drainage and vent pipe and fittings must be made and certified to meet specific material standards, reflecting this traditional, durable piping material still used in many drainage applications.
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.