Drain set up

Discussion in 'Canadian Plumbing Code Questions' started by JimmyJames, Jun 19, 2018.

  1. JimmyJames

    JimmyJames New Member

    Jun 19, 2018
    Hello all, I recently decided to change my laundry room sink, in doing so I found this AAV and backflow. the rise on the washer drain is too short.

    I have a main always closed backflow but I'm still concerned about the AAV....does it stop water in the case of a back up? The AAV should not be so low, would it cause any problems if I raised it to about 5 feet or put it right up into the joists? I also have my main plumbing stack about 8 feet away I am starting to think I should just vent into the main.


    Some clarification would be greatly appreciated on this matter.

    Thank you.

  2. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    I would be more concerned about the always closed backflow valve, although since it is just handling laundry, it might not get stuck open, as the whole-house flapper valves usually do.

    While it should stop the backflow, raising it would be superior. I think

    You are not allowed to use the plumbing stack that is carrying drainage as a vent.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    The AAV has NOTHING to do with stopping backflows and it makes very little difference how high it is, other than possibly accumulating debris from the water.
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