(206) 949-5683, Top Rated Plumber, Seattle
Page 1 of 2 12 LastLast
Results 1 to 15 of 17

Thread: Washing machine has no trap, what should i do to correct

  1. #1
    DIY Junior Member joesiah's Avatar
    Join Date
    Jan 2013
    Location
    Connecticut
    Posts
    7

    Default Washing machine has no trap, what should i do to correct

    Hi while doing a remodel i notice that my washing machine has no trap, it shares a drain line with the bathroom sink, the sink has a ptrap under the sink but there is not one for the washing machine. They both have a 1-1/2 inch pipe which is goes into a 2" with a aav then in to a 3" into the main sewer line. My questions are does the washing machine need a 2" pipe, and if not can i just put a ptrap down the line from both drains to fix the problem. I am attaching a picture of the connections and a drawing of how it is set up.. thanks. I can upload a video if it will help.. Name:  IMG_3771.jpg
Views: 1753
Size:  48.3 KBName:  IMG_3770.jpg
Views: 1460
Size:  53.5 KBName:  washing machine drain.jpg
Views: 1755
Size:  43.5 KB

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,602

    Default

    IF that piece with the 45 on it is the washer drain, then it DOES need a trap, but NOT like you show putting one in.
    Licensed residential and commercial plumber

  3. #3
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Location
    Land of Cheese
    Posts
    3,134

    Default

    The fixtures must be trapped individually and each trap will need it's own vent. A proper laundry drain is 2" What you are proposing with the running trap would not be approved anywhere in the U.S.A.

    There are several good threads with pictures here in the forums showing how to properly plumb a washer. Take your time and look around.

  4. #4
    DIY Junior Member joesiah's Avatar
    Join Date
    Jan 2013
    Location
    Connecticut
    Posts
    7

    Default

    Okay so i need to remove whats there and go with a 2" for the washing machine, that is fine, before i do i want to make sure what im putting in is code or as close as I can get.. don't want any problems in the future. i have made a drawing of what im thinking about setting up.. drawing is looking down on the pipe.. please let me know if this will work?.. thanks.

    Name:  wasing machine new plumb.jpg
Views: 1411
Size:  15.0 KB

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,374

    Default

    AAV's are not allowed everywhere, the drain system needs at least one atmospheric vent, and if there's a reasonable way to vent what you're doing atmospherically, the inspector will probably require it to be done that way. An AAV is mechanical device that will eventually fail, needs access for that eventuality, and doesn't work in all situations. It can only let air in, and a washing machine's pump may end up pressurizing the pipe with no place for that air to go, thus, the AAV won't work and you'd end up gurgling and spitting in the lav sink.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    DIY Junior Member joesiah's Avatar
    Join Date
    Jan 2013
    Location
    Connecticut
    Posts
    7

    Default

    There are several vents in the system going out the roof, at least 3, main, kitchen and bath.. do i still need to add one to this part of the system?

  7. #7
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,602

    Default

    You have to understand that an AAV can CAUSE as many problems as it cures, depending various circumstances that can occur over time. IF you installed it EXACTLY as you have drawn it, you would create TWO "running traps". Actually, that "washer drain" looks like it was originally the vent for the sink so there may be a pipe that it was connected to at the ceiling somewhere.
    Licensed residential and commercial plumber

  8. #8
    DIY Junior Member joesiah's Avatar
    Join Date
    Jan 2013
    Location
    Connecticut
    Posts
    7

    Default

    Two Running Traps? What is that? is that a bad thing? The washer drain was not a vent pipe, I know this for sure because this is an old remodel job, which obviously was not done correctly... don't know how it got past the inspector this way... I haven't had any sewer gass issues or drain issues so far, just noticed it and thought i should correct it, I just want it fixed and i can't go through two floors and the roof to vent... So what is my best option??

  9. #9
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Location
    Land of Cheese
    Posts
    3,134

    Default

    A running trap is a trap that is installed in the horizontal drain, and is not allowed. The fixture drain needs to drop vertically into the trap.

    It is pretty hard to say what your best option is without being there to see where all the walls above are, where other plumbing is routed, and what the obstacles are.

    To say you "can't" doesn't mean it cannot be done.

    This is in a finished basement?

  10. #10
    DIY Junior Member joesiah's Avatar
    Join Date
    Jan 2013
    Location
    Connecticut
    Posts
    7

    Default

    Here is a video,
    I think I’m just going to add a ptrap to the washing machine and tie back into the existing pipe..



  11. #11
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Location
    Land of Cheese
    Posts
    3,134

    Default

    The washer will siphon it's trap, so you would not be accomplishing anything.

    If I could for some reason not install a proper vent there, I would install a 2" washer standpipe and trap, draining into a new 2" horizontal pipe running below the sink's drain pipe into a new sanitary tee installed below the existing one.

    The new trap would be vented by a riser which goes up to a point near the ceiling with the AAV as high as possible on the top. I would install the new vent riser within a couple feet of the trap.
    Last edited by cacher_chick; 01-17-2013 at 07:16 PM.

  12. #12
    DIY Junior Member joesiah's Avatar
    Join Date
    Jan 2013
    Location
    Connecticut
    Posts
    7

    Default

    how about this?
    i think this will be the quickest way ..

    Name:  New Drain setup.jpg
Views: 1311
Size:  25.7 KB

  13. #13
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,374

    Default

    EACH fixture needs it's own, separate (they can be combined higher, if done right) vent. No, that is not better. Often, the easier route does not work.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  14. #14
    DIY Junior Member joesiah's Avatar
    Join Date
    Jan 2013
    Location
    Connecticut
    Posts
    7

    Default

    I talked to a local plumber and he said i could do this.. any thoughts.. thanks.

    Name:  New Drain.jpg
Views: 1270
Size:  26.6 KB

  15. #15
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Location
    Land of Cheese
    Posts
    3,134

    Default

    Your drawing does not portray the actual layout very well.

    There is little to say you would not be allowed to connect it in that manner, if the washing machine standpipe and branch drain were all 2", and someone made a double-fixture fitting in that size.

    If the line ever becomes restricted, the washer is going to pump it's entire load into your bathroom.
    Last edited by cacher_chick; 02-06-2013 at 03:33 PM.

Similar Threads

  1. vertical distance to p-trap for washing machine
    By sam. in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 4
    Last Post: 07-04-2011, 02:48 PM
  2. washing machine drain-p trap info
    By crazycraig68 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 24
    Last Post: 06-02-2010, 12:32 PM
  3. Help with Washing Machine trap/drain/vent
    By schomeowner in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 4
    Last Post: 11-08-2008, 09:29 PM
  4. Washing machine trap
    By Giles in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 19
    Last Post: 10-05-2008, 05:18 PM
  5. Trap on washing machine drain?
    By twojciac in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 10-17-2007, 01:48 PM

Tags for this Thread

Bookmarks

Posting Permissions

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