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Thread: Adding half bath

  1. #1

    Default Adding half bath

    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 Images Attached Images  

  2. #2

    Default

    Looks okay to me... I would use wye's rather than tees on all the drains.

  3. #3

    Default

    Great thank you.
    My next task is to figure out the proper fittings to use.

  4. #4
    Homeowner geniescience's Avatar
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    Default

    use tee's on the two new ones, as you have shown. About the rest of the diagram: no comment.

    david

  5. #5

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    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. #6
    Homeowner geniescience's Avatar
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    Default

    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. #7
    Commercial Plumber markts30's Avatar
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    Default 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 Images Attached Images     

  8. #8

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    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. #9

    Default

    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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