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Thread: Basement Ejector Pump Venting for Washing Machine

  1. #1
    DIY Junior Member dbgreg's Avatar
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    Cool Basement Ejector Pump Venting for Washing Machine

    I have an existing wet vented ejector system in my basement floor. I am planning on adding a washing machine drain to this system and have some questions about the best way to do this.

    I have an attached proposed diagram to help explain the system and questions that I have.

    If anyone has better suggestions - feel free to suggest and I can update the diagram :}

    My questions about this proposed rough-in:
    1. Can the washing machine vent "C" share the stack with ejector pump?
    (best if it does not, but I do not have another accessible vent)

    2. Does this washer drain need to be vented in the first place?
    (since rest of system is wet vented - will add or not adding the vent cause trap problems?)

    3. Curious, can vent C be 2" pipe instead of a standard 1 1/2" pipe
    (Is there a reason that standard vents are 1 1/2" for flow, etc.?)

    4. Should I vent sink E? or leave it wet vented like the rest of that system?
    Will venting cause problems pulling the traps?

    Thanks and look forward to recommendations!
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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    There is no vent on the toilet or shower and the laundry should tie in below the sink drain. Vent E should tie into C. Where C ties into the stack it should be 6" higher then the stand pipe on the laundry drain.

    John

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    DIY Junior Member dbgreg's Avatar
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    Red face Updated image to reflect John's input

    Thanks John - Updated image to reflect your recommendations

    Thanks,
    Greg
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    You can't dump the washer drain into the lav.

    IPC code, the washer needs to drain into a 3" stack or main, it can not share the drain with the lav.

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Quote Originally Posted by Peter Griffin View Post
    You can't dump the washer drain into the lav.

    IPC code, the washer needs to drain into a 3" stack or main, it can not share the drain with the lav.
    Sorry, I didn't see the reducer under the slab. I saw the 4" going beyond the toilet and didn't look any further.

    John

  6. #6
    DIY Junior Member dbgreg's Avatar
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    Cool

    So I need to cut out the concrete to the 4" main pipe and tie "D" directly into that 4"
    Leave the venting "C" on the washer drain and still add the vent "E" to the lav?
    or will "E" venting cause any problems?

    Thanks again,
    Greg
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    Forum Admin, Expert Plumber Terry's Avatar
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    That picture makes me woozy.

    I prefer to individually vent fixtures that are going to a pump system.
    For the price of a few fittings, you know it will work.

    And dumping a washer into the end of that?
    That will do a good job of siphoning all the traps below it.

    Have you ever wondered how smelly a sewage pit can get?
    Siphon a few traps and you will know.

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