Putting elbow in soil stack in Canada

Discussion in 'Canadian Plumbing Code Questions' started by causie, Jun 21, 2010.

  1. causie

    causie New Member

    Messages:
    2
    Location:
    Ottawa
    I've just torn out gyproc above sink in order to put a sunken medicine cabinet in wall. Unfortunately the soil stack runs right up the middle. Is it OK to put elbow in to make stack run around medicine cabinet?
  2. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Messages:
    810
    Location:
    Penticton, BC
    It's probably not a "stack". That term is thrown around quite losely. It's probably simply just a vent. If it's just a vent then you can most certainly offset it around the cabinet. And if it's a wet vent extending through more then one story it's called a "soil-or-waste stack wet vent" and there are some rules that come into play when putting offsets in them. But none of these rules would probably apply to you anyway because you're offsetting mabye 2 feet. And you're allowed to offset a vertical wet vent by up to 1.2m for pipe sizes 2 inches and less.
  3. causie

    causie New Member

    Messages:
    2
    Location:
    Ottawa
    Thanks so much for your input. Do you think it's an issue to do it at 90 degrees? This would mean 4 elbows.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,226
    Location:
    Cave Creek, Arizona
    As long as it is just an air vent, you can use as many elbows as necessary, and offset as far as you have to.
  5. DavidTu

    DavidTu Member

    Messages:
    237
    Location:
    Seattle, WA
    Even for the vent, though, if you set it going horiztonal for the offset, it has to be 6" above the lip of the sink before you do so (assuming it is the sink's vent).
  6. Terry

    Terry Administrator Staff Member

    Messages:
    14,749
    Location:
    Bothell, Washington
    This is in Seattle, UPC plumbing code.
    They don't have "soil-or-waste stack wet vents" here.

    If it is indeed a vent, then you can use 45's below 42" or "waste" fittings, not vent 90's
    I don't even buy vent 90's. They cost more and can only be used on vents, whereas medium 90's can be used many more places.
  7. locus123

    locus123 New Member

    Messages:
    31
    Location:
    Ontario
    What if it were the actual stack itself? In my kitchen, the stack (which has a tub, sink and toilet feeding into it in the bathroom above), runs on the outside of the 2x6 wall. I was thinking of adding an offset of about the size of the stack (so 3", with 2x45's at the top and 2x45's at the bottom), just to recess it behind the wall. This would avoid having one of those unsightly "boxes" in the middle of the countertop. I would only offset it for the distance between the upper and lower cabinets - I don't mind losing the space in the cabinets.
  8. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Messages:
    810
    Location:
    Penticton, BC
    I think you'll find the answer to this question in my post above.
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