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Thread: Please look at my washing machine/utility sink drain setup...need advice.

  1. #1
    Network engineer Dave88LX's Avatar
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    Default Please look at my washing machine/utility sink drain setup...need advice.

    Previous homeowner was victim of watching too many DIY reality shows, nothing has been done correctly or works like it should. If this IS correct, then I will eat crow.

    Tall pipe on the left is where the washing machine drains into. There is a utility sink on the right side fitting. No venting. I don't know if the 2" running up the wall runs to a main vent, if it is its own vent, or if it's used as a drain from something upstairs. I will check and find out.

    When the washer drains, the sink fills up near to the top. I don't know if I have an obstruction or if it's due to lack of vent; or a combination of both. I'm going to try and clean everything out just in case.

    I'm doing a small remodel on this laundry room (mainly just painting the concrete walls, replacing the sink, installing a cheap floor...ripped out black-molded carpet that was used in the laundry room...WTH???)




    Left supply lines are for the washer. Right is for the sink.




    Old drain. Won't work with the new sink. Old sink was raised 1" off the floor just so they had clearance.



    Thinking the drain T needs to be moved to the right a bit, and then done correctly, with the correct fitting.

  2. #2
    Network engineer Dave88LX's Avatar
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    OK I looked at the pipe a bit closer.

    I turned on the upstairs sink, and it's draining down the pipe labeled below. The pipe that the washing machine is draining into is the one that's a couple feet closer to us.





    In this picture, you see the drain pipe for the upstairs sink on the left. The pipe on the right is the one that's hooked to the laundry machine drain. I would ASSume that this is also the vent for the sink? I looked in the attic, and there is a pipe coming up in this same area tied over into another pipe (vent) going up through the roof. This leads me to believe this pipe is purely vent (no drain coming from above).

    With that said, what is the proper way to set up the washer and sink traps/vents? Thank you!

    Last edited by Dave88LX; 11-27-2011 at 01:14 PM.

  3. #3
    In the Trades mtcummins's Avatar
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    is there a bathroom above the kitchen on a 2nd floor? if not, then most likely this is a properly vented system. if there is, you likely have a lav/tub draining down through this line and you have a wet vent on your laundry. this is not ideal or legal, but does give some venting as opposed to none.

    have you opened up that cleanout wye and snaked out the drain? this sounds like a clogged up underground, and thankfully you were left with a cleanout, albeit an awkwardly placed one, that you can use. you'll want to rent a good sized power snake for this, as these lines can go a long way and those old cast iron lines tend to get all corroded and need a little power to break through some of the gunk.

    As for the trap, its not horrible, but you'll want to cut off the elbow on the sink trap and glue on an adapter and fit a standard P trap to the sink. This should give you the side to side flexibility to get it to line up properly to the sink. a new tailpiece wouldn't hurt either, with all plastic parts rather than that mix and match of plastic and metal.

    it looks like you're darn near level on that drain line from the washer to the drain, you might want to lift it up and resupport it about an inch or so higher to get proper fall.

  4. #4
    Network engineer Dave88LX's Avatar
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    At HD now, mobile.
    Nothing above the kitchen. Haven't snaked yet, but am buying one.
    No ABS here I can see. Think I am going to cut it all off, couple a Fernco to the stub, and redo it in PVC.
    ...I'll check back in a bit, low batt.

  5. #5
    DIY Senior Member dlarrivee's Avatar
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    And here I thought that each trap required it's own vent...

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    Forum Admin, Expert Plumber Terry's Avatar
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    The washer will need to be a 2" p-trap and standpipe interior dimension. The vent can be 1-1/2"
    It will need a vent between the washer p-trap and the waste standpipe.

    The laundry tray drain, (sink drain) will need 2" until the vent, and then you can use a 1-1/2" trap arm and vent.

    It's easier to have the sink drain located above the washer piping, and then the washer vent and the sink vent can tie together at 42" above the floor.

    The original pictures are not correct. It should be torn out and be redone.

    Here is a nice link to Bert Polk's plumbing tips
    Last edited by Terry; 11-27-2011 at 06:24 PM.

  7. #7
    Network engineer Dave88LX's Avatar
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    I'm not entirely sure what you mean...I was going to have the sink and washer on the same drain line. Please forgive me, I don't know all the terminology.

    Also, I did not see black ABS at Home Depot. Should I look elsewhere and use all ABS? Or, should I redo it in PVC, with a Fernco type rubber connector near the waste stack connecting the ABS to new PVC? That still leaves me needing something up top. Unless I used a PVC Sanitary-T with 2x PVC "stubs" sticking out up/down, with a Fernco rubber connector on each end of it.

    Please forgive my hack-up Visio job here (feel free to draw on it!). I thought this was the solution you are suggesting, but looking closer at your post, I don't think it is.

    Thank you very much.

    Last edited by Dave88LX; 11-27-2011 at 05:54 PM.

  8. #8
    DIY Senior Member dlarrivee's Avatar
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    The sanitary tee on it's side is a problem.

    The extra pipe you added, does nothing.

  9. #9
    Test, Don't Guess! cacher_chick's Avatar
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    It's not pretty, but try this-

    Name:  laundry.JPG
Views: 7043
Size:  5.9 KB
    Last edited by cacher_chick; 11-27-2011 at 07:13 PM.

  10. #10
    Network engineer Dave88LX's Avatar
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    Quote Originally Posted by dlarrivee View Post
    The sanitary tee on it's side is a problem.
    I was going off of the popular diagram that Terry uses on this site. Is it incorrect?

    Last edited by Dave88LX; 11-27-2011 at 07:32 PM.

  11. #11
    Test, Don't Guess! cacher_chick's Avatar
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    Quote Originally Posted by Dave88LX View Post
    I was going off of the popular diagram that Terry uses on this site. Is it incorrect?
    A sanitary tee can only be placed on it's back for a dry vent take-off, never a drain attachment. Terry's fitting is a combo, which is the equivalent of a wye and 1/8 bend.
    Terry's is correct in this regard.
    Last edited by cacher_chick; 11-27-2011 at 07:39 PM.

  12. #12
    Network engineer Dave88LX's Avatar
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    Quote Originally Posted by cacher_chick View Post
    It's not pretty, but try this-

    Name:  laundry.JPG
Views: 7043
Size:  5.9 KB
    Are you using a different horizontal pipe for each drain into the main stack on the right? Problem is, if the horizontal drain pipe is any higher, it will be at or above the level of the sink drain, see here:

    Last edited by Dave88LX; 11-27-2011 at 08:00 PM.

  13. #13
    Test, Don't Guess! cacher_chick's Avatar
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    You will have to move the clean out to a position ABOVE the 2 new sanitary tees so the drain lines can be run lower.

  14. #14
    DIY Senior Member dlarrivee's Avatar
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    Quote Originally Posted by Dave88LX View Post
    I was going off of the popular diagram that Terry uses on this site.
    No you weren't, your drawing says "sanitary tee pointing straight out for sink drain"... That is what I was referring to.

  15. #15
    Network engineer Dave88LX's Avatar
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    Quote Originally Posted by cacher_chick View Post
    A sanitary tee can only be placed on it's back for a dry vent take-off, never a drain attachment. Terry's fitting is a combo, which is the equivalent of a wye and 1/8 bend.
    Terry's is correct in this regard.
    I misunderstood dlarrivee's post about being on it's side, I thought that meant side as in the vertical pipe. I was thinking of the bottom one as more 'on its back', but nevertheless, I would still be in the wrong!

    Must be a pretty common mistake that people make huh...I'm looking at that guide that Terry posted above.

    Last edited by Dave88LX; 11-27-2011 at 09:12 PM.

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