New Washing Machine Vent Question

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by dennpad, Jan 2, 2013.

  1. dennpad

    dennpad New Member

    Joined:
    Dec 31, 2012
    Location:
    Seattle
    I recently installed a new drain and supply lines for a washing machine (see attached). I tapped into the main waste/soil stack just before it exits the house through the wall. The 18" standpipe is two feet away from the stack. I added a vent to be used with an AAV. My question: do I need the vent? I would prefer not to use the AAV if it's not required. I thought I read somewhere if the appliance is within 5 feet of the main stack, a vent is not necessary.

    Any and all help is much appreciated...
     

    Attached Files:

  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Joined:
    Jan 5, 2008
    Occupation:
    Test, Don't Guess!
    Location:
    Land of Cheese
    The main stack is only considered to be a vent above the point of which the highest fixture drain is connected to it.
    The washing machine trap is required to have a vent.
     
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  4. dennpad

    dennpad New Member

    Joined:
    Dec 31, 2012
    Location:
    Seattle
    Thanks for your reply, cacher_chick...
     
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The washer should have a 2" p-trap and standpipe.
    The vent can be 1.5"
     
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