The Ontario Building Code | Trap Seals
7.4.5.5. Trap Seals
(1) Provision shall be made for maintaining the trapseal of a floor drain or a hub drain by the use of a trap seal primer, by using the drain as a receptacle for an indirectly connected drinking fountain, or by equally effective means.
(2) Where a mechanical device is installed to furnish water to a trap, the pipe or tube conveying water from the device to the trap shall be at least ⅜ in. inside diameter.
7.4.6. Arrangement of drainage Piping
In Plain Language
Trap seals, the water that sits in a trap to block sewer gas, must be maintained using a trap seal primer, indirect connection to the drain, or another approved method, so the seal doesn't dry out and let gas through.
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.