(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 5 of 5

Thread: Adding laundry sink - need help!

  1. #1

    Default Adding laundry sink - need help!

    I'd like to add a laundry sink to my existing plumbing.

    Can I just tee into the drain/vent pipe and then add a P-trap for the sink?

    I should mention that I am in Oregon and code here considers a washer to have 3 DFU's.

    I'd prefer to put the sink in the stud bay on the right, but if it's as easy as adding a tee to the vent pipe I could just put the sink on the lefthand bay instead.

    Suggestions welcome.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default Lt

    You can put a tee in the riser, turned to the side with an elbow and put the sink anywhere you want it, assuming the drain will be low enough for your laundry sink.

  3. #3


    Could I tee off of the upstairs dual vanity drain riser if I wanted or should I stick to the washer drain/vent riser.

    I'm now thinking I may move the sink to the lefthand stud bay instead...


  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Bothell, Washington
    Blog Entries


    You can't put the tee in the lav line.
    Draining the lavs above, would siphon the laundry trap p-trap.

    If you want to come off of the left, you should change the waste line to 2" until you tee or wye off, and run a seperate vent for the laundry tray.
    That vent could tie back into the washer vent. I don't know how that would fit in the wall though.

    Or you can put the santee above the washer, and turn the santee left, and then 90 out from the wall.

  5. #5



    I think I'll just put the sink in the right hand stud bay.

    If I put the sink drain 90 at 20" above the floor, can I just run horizontally across to the left at that height until I intersect the washer vent and then san-t it in?

    Or should go down from the sink drain 90 and then 90 again to the left and run just above the 2" washer drain through the stud and san-t as low as possible (just above the washer san-t).

    Does it matter?



Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts