Drain set up

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

  1. JimmyJames

    JimmyJames New Member

    Joined:
    Jun 19, 2018
    Location:
    Montreal
    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.

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    Some clarification would be greatly appreciated on this matter.

    Thank you.

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  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    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

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    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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