DWV configuration good?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Bobby P, Jan 1, 2010.

  1. Bobby P

    Bobby P New Member

    Messages:
    6
    Location:
    Portland, Oregon
    Hello, I am a DIY guy, putting in a second floor bathroom, and want to make sure that my DWV setup is good. Below are images that show how I would lay it out. Someone told me that I could wet vent the Lav from the WC if it was 2", is that right? This may be specific to Oregon/Portland code, right? Would I drain the lav into the toilet drain before it hits the 3x3(x2) bend, or after?

    The images are below.

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  2. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    From what I can tell you're not wet venting the lav here anyways.

    I don't understand what fitting you plan to use where you have a 90 degree bend and a vent coming out the side of it though, you used 2 of these non-existent fittings in the drawing.
  3. Bobby P

    Bobby P New Member

    Messages:
    6
    Location:
    Portland, Oregon
    Yes, I vented the lav by itself, but someone who saw this image suggested that I just wet vent the lav to save putting in another vent.

    The horizontal fitting is a 3x3x2, where the 3" is running waste horizontally (at a slope, of course), and the 2" is for a vertical vent.
  4. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Messages:
    1,140
    Location:
    South*East
    The fitting is called a 3x2 side outlet ell. By far not the best way of piping it but the fitting is made.

    John
  5. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    I've never seen them in use like this...
  6. Bobby P

    Bobby P New Member

    Messages:
    6
    Location:
    Portland, Oregon
    Should I be using a Wye there instead?
  7. Bobby P

    Bobby P New Member

    Messages:
    6
    Location:
    Portland, Oregon
    I need to make the inspector happy, so whatever fitting they are used to seeing in this type of situation I will use.
  8. RTAPlumbing

    RTAPlumbing Plumber

    Messages:
    27
    Location:
    lawrenceville, GA
    to be honest with you that is a terrible design and it would fail immediately in Georgia.
  9. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    I didn't even know where to begin except to say that most all of it is wrong or poorly designed.
  10. Bobby P

    Bobby P New Member

    Messages:
    6
    Location:
    Portland, Oregon
    Wow, I thought I was doing better than that...I got a lot of the design from a local plumber, but he is too busy to keep helping me (for pay, of course) :(

    I can't get anyone locally to come in and just give me a design, I think they want to do all the work or nothing. I can't afford that, so I am on my own or the project doesn't get done. Anyway, I am committed to this, and will have to keep at it until I get it right. I attached images of new fittings below.

    Someone suggested that I just wet vent the WC through the shower vent, but that vent is 8-9 feet away and shares the downstairs 2" kitchen lav and dishwasher vent, is that OK?

    I would be VERY appreciative for any advice, thanks!!

    [​IMG]

    [​IMG]

    [​IMG]
  11. jc60618

    jc60618 DIY Junior Member

    Messages:
    88
    Location:
    Chicago
    Suspended Pipe

    I dont know if you can run 3" suspended in your area, in chicago its not allowed. However lets assume that you can use 3".

    Also instead of using a regular combo to pick up your toilet you can use a 3" combo with a 2" side inlet. By using this fitting you can eliminate the 3x3x2 sanitary tee. Just make sure you run that line dirrectly below the center of your plumbing wall. This will allow you to bring your 2" vent directly up without doing an offset.

    Attached Files:

    Last edited: Jan 3, 2010
  12. Bobby P

    Bobby P New Member

    Messages:
    6
    Location:
    Portland, Oregon
    Thanks jc60618, this is very helpful!!
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