New Washing Machine Vent Question

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

  1. dennpad

    dennpad New Member

    Messages:
    2
    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!

    Messages:
    3,281
    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.
  3. dennpad

    dennpad New Member

    Messages:
    2
    Location:
    Seattle
    Thanks for your reply, cacher_chick...
  4. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    The washer should have a 2" p-trap and standpipe.
    The vent can be 1.5"
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