altadata
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Not to imply the the US is smarter or better than Canada, but there are reasons our vent sizes are larger. Perhaps the Canadian codes don't require it at this time, but I would be surprised if at some future date they will. Why not go with the larger size since it will be easy to do now and the only expense will be the larger pipe. Same with the washer drain. We get calls for help on a fairly regular basis from people who are trying to use their old 1-1/2" washer drain with a new washer and are experiencing flooding.
Why not? In my case the answer is because the pipe that will be feeding the air into this 2" vent pipe is a 1.5' anyway ( I mean the pipe coming from upstairs that I will tie into venting all these fixtures in the basement is a 1.5" ). Is still a good idea to use a 2" pipe?