Which fitting? Backflow prevention?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mculik5, Feb 15, 2018.

  1. mculik5

    mculik5 New Member

    Joined:
    Jun 23, 2017
    Location:
    New Jersey
    Renovating my second-floor hall bath/laundry room. Will be installing a floor drain as extra protection against washing machine leaks and catastrophic failures.

    The plan is to tap into the existing washing machine drain pipe. The drain will include a trap primer.

    Attached is a rough picture. Blue is framing, red is existing drain line, black is what I plan to add. Questions below the picture.

    [​IMG]

    Three questions:

    1. Anything wrong with this approach?
    2. What fitting should I use to tap into the existing drain pipe? Wye, tee, or sani-tee?
    3. Do I need to worry about backflow prevention? If so, what do you use?

    On the backflow prevention point, I have two concerns that I'm not sure are realistic:

    - If the drain pipes downstream of this room back up, I don't want dirty water flooding the floor. Eventually, the water will overflow the washing machine standpipe, so not sure if this is a valid concern, but still...
    - If the washing machine pumps water out so quickly as to temporarily flood the drain pipe above floor level, I don't want the water to flood the floor.

    Thanks for your help!
     
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