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Thread: Adding washing machine to drain line

  1. #1

    Default Adding washing machine to drain line

    I have a drain 1.5" line with p trap from the kitchen to the exit 2in pipe. There is also a dish washing machine plumbed into the sink drain line.
    I am adding a clothing washing machine beside the dish washer and would like to plumb into this line.
    SHOULD I add a 2nd dedicated drain line from the clothing washer to the exit down line to sewer OR can I tie into the existing line?
    THANKS

  2. #2
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Location
    Yakima WA
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    7,246

    Default Washer drain

    A clothes washer requires a 2" drain. The sink and dw drain is only 1-1/2", so you'd be open for real problems. Add a 2" trapped standpipe for the clothes washer.

  3. #3
    Plumber Deb's Avatar
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    Sep 2004
    Location
    Idaho
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    200

    Default Deb

    Actually, the kitchen sink drain should also be 2", so it is already undersized. The washing machine drainage must be done correctly. The p-trap should be 6-18" off the floor. The standpipe 18-30" in height. This must also be vented through the roof or tie in with another vent 6" above the flood rim level of the fixture. Install a cleanout--lint can be a problem in washing machine drainage lines.
    Deb
    The Pipewench

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