Toilet Shower Sink drain venting, Canada

Discussion in 'Canadian Plumbing Code Questions' started by dodge1930, Jun 29, 2010.

  1. dodge1930

    dodge1930 New Member

    Jun 29, 2010
    Montreal. QC
    I am relocating my bathroom and the new setup will have: from basement 3" waste stack running up to basement ceiling then horizontal 18' to the front of the house into wye 3x3x2 to pick up shower then 4' into wye 3x3x3 to pick up toilet then into wye 3x3x2 to pick up sink then 3" to 2" to vent up the wall to roof.
    4' between shower and toilet.
    sink 3-4' from 3"
    3" runs directly under shower and toilet bewtween floor joist.

    Is it ok to vent this way?


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    Last edited: Jun 29, 2010
  2. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Jun 22, 2009
    Red Seal Journeyman Plumber & Licensed Gas Fitter
    Penticton, BC
    Nope you can't do that because you have a fly dry vent AND you are wet venting a fixture past a water closet. You can't do this either.

    You need to tie the sink drain into the vertical "2 vent" you have labelled. Then you also need to try and tie the shower drain in upstream of the toilets trap arm. And if you can't do this then you would technically need to seperately vent the shower without a flat dry vent.
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