Adding half bath

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by barryw, Mar 13, 2007.

  1. barryw

    barryw New Member

    Messages:
    10
    Hi. I plan to replace all of the galvanized pipes in my house and add a half bath on the second floor.
    I have attached a diagram of the existing drains and vents as well as my proposed second floor half bath. I want to run a 3" drain for a second floor toilet and sink and tie the vent into the existing 4" stack. Will this work?

    To clarify, the bath tub and sink are vented through a 'common vent?',
    the basement sink vent also vents a basement toilet not on the diagram.

    I didn't draw to scale or consider connectors, I am only concerned with the flow at this point.
    Thank You!

    Attached Files:

  2. Randyj

    Randyj Master Plumber

    Messages:
    1,047
    Location:
    Alabama
    Looks okay to me... I would use wye's rather than tees on all the drains.
  3. barryw

    barryw New Member

    Messages:
    10
    Great thank you.
    My next task is to figure out the proper fittings to use.
  4. use tee's on the two new ones, as you have shown. About the rest of the diagram: no comment.

    david
  5. barryw

    barryw New Member

    Messages:
    10
    Is it possible to drain the new second floor toilet into the existing 4" stack and revent all fixtures below it - as opposed to running a new 3" stack and tying into the base of the main stack.
  6. Yes.

    Draw the whole diagram again, with real Tee's and Wye's. The way it looks now is not good at all. Very bad.

    david
  7. markts30

    markts30 Commercial Plumber

    Messages:
    630
    Location:
    Phoenix, AZ
    quick rendering...

    Here is a quick rendering...
    a few views - one of al pipe and then broken down by floor as the whole think is confusing...

    Attached Files:

  8. barryw

    barryw New Member

    Messages:
    10
    Great thanks for the pictures.
    I think I am going to have to just add a three inch DWV from the second floor. I own a cape cod/bungalow style house so the entire upstairs is basically open, which leaves very few areas to hide additional vent pipes.
    So I am going to redraw everything with a couple of changes..thanks again.
  9. barryw

    barryw New Member

    Messages:
    10
    Ok here is my latest diagram.
    Its not to scale so it looks spread out, but that was the only way to fit everything in.
    I plan to replace everything with PVC except for the basement sink/basement toilet vent and drain.
    I plan to use 2" drains for the first floor and 1.5" for second floor LAV; 2" vents.
    Hopefully most of my connections are correct.
    Thanks,
    Barry

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