The Ontario Building Code | Location and Cleanout for Building Traps
18.104.22.168. Location and Cleanout for building Traps
(1) Where a building trapis installed, it shall,
(a) be provided with a cleanout fitting on the upstream side of and directly over the trap,
(b) be located upstream of the building cleanout, and
(c) be located,
(i) inside the building as close as practical to the place where the building drain leaves the building, or
(ii) outside the building in a manhole.