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Thread: New Washing Machine Vent Question

  1. #1
    DIY Junior Member dennpad's Avatar
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    Default New Washing Machine Vent Question

    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...
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  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    Default

    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. #3
    DIY Junior Member dennpad's Avatar
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    Thanks for your reply, cacher_chick...

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    Forum Admin, Expert Plumber Terry's Avatar
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    The washer should have a 2" p-trap and standpipe.
    The vent can be 1.5"

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