Drain washing machine on first floor to laundry tub in basement?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by carlmm, Jul 29, 2013.

  1. carlmm

    carlmm New Member

    Messages:
    3
    Location:
    Nebraska
    Would this be feasible?

    There is a laundry tub/sink in the basement directly under the area where the washer and dryer will be placed on the first floor. Could I run a 2" drain line into the laundry tub? If so, would the drain from the washer to the laundry tub need the normal P trap and venting? (The laundry tub has a trap and is vented.)

    Apologies in advance if this has been discussed elsewhere. I looked and didn't see anything on point.

    Thanks!
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,262
    Location:
    New England
    You have to be careful how you do this...the outlet of the WM must be within the specs, or it will just siphon itself dry during the fill. Generally, no, I don't think you'd get away with this. You may be able to tie it into the drain of the sink, IF it is large enough, but you'd also need to vent it properly. See what the pros have to say about this, as I'm not up on all of the codes, but the physics are clear...you'd need a standpipe for it so it didn't siphon.
  3. leejosepho

    leejosepho DIY scratch-pad engineer

    That depends upon what you might mean by "feasible" since it certainly would not pass an inspection. To do this properly, you need to run a drain line with trap down to a drain line of at least equal size, then run a vent on up to another vent line or out through the roof. But for a temporary drain while getting that done, a piece of 1-1/4" flex hose might do just fine as long as you fasten each end to something to keep it high enough for the washer and the other end inside the sink.
  4. Terry

    Terry Administrator Staff Member

    Messages:
    15,294
    Location:
    Bothell, Washington

    No.

    804.1 All plumbing fixtures or other receptors

    receiving the discharge of indirect waste pipes shall be
    approved for the use proposed and shall be of such
    shape and capacity as to prevent splashing or flooding
    and shall be located where they are readily accessible
    for inspection and cleaning. No standpipe receptor for
    any clothes washer shall extend more than thirty (30)
    inches (762 mm), nor less than eighteen (18) inches
    (457 mm) above its trap. No trap for any clothes
    washer standpipe receptor shall be installed below the
    floor, but shall be roughed in not less than six (6)
    inches (152 mm) and not more than eighteen (18)
    inches (457 mm) above the floor.


    Below the floor would also include any floor below.

    Just install plumbing for the washer as per code and you will be fine.
  5. carlmm

    carlmm New Member

    Messages:
    3
    Location:
    Nebraska
    Thanks guys!
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,034
    Location:
    Cave Creek, Arizona
    However, it he just stuck a pipe through the floor into the laundry sink and hooked the washer drain over the top of it, all of the reasons for NOT having a long riser or trap under the floor would be invalid.
  7. cwhyu2

    cwhyu2 Consultant

    Messages:
    1,348
    Location:
    Cincinnati OH
    And that would be called an indirect waste.
  8. carlmm

    carlmm New Member

    Messages:
    3
    Location:
    Nebraska
    That's sort of what I was thinking . . . but I want to comply with the local municipal code. I suppose that I'll err on the side of caution.
  9. Joe Six Pack

    Joe Six Pack New Member

    Messages:
    31
    Location:
    Anchorage AK
    Sort of like a rain gutter?
    Would taht work the for shower or tub to?
    How buout a kicthen sikn? can I rain gutter atht too?
  10. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,034
    Location:
    Cave Creek, Arizona
    I once had a customer who wanted to connect his tub to a 3/4" pipe dropping into the basement. I told him if he did it, the tub would such anything within five feet of the tub down the drain, including his kids.
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