Shop bathroom drain rough-in

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by timf, Jun 14, 2012.

  1. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    Hi,

    I’m looking for help on a proper way to rough-in drains for a bathroom in a shop.

    There is an existing 4†drain on an exterior wall. I need to connect a toilet, utility sink, and catch basin for a floor drain.

    The building is serviced by a dedicated septic, so I understand I need a 3†vent through the roof of the building.

    Any suggestions on how I should proceed or on which fittings you would suggest?

    The bathroom floor will be a concrete slab and I need to rough in drains before calling for an inspection.

    bath.jpg

    Thank you!
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,480
    Location:
    Cave Creek, Arizona
    In most areas, you draw your plumbing plan BEFORE they give you the permit to install it. Then, IF you install it that way, they inspect it and give their approval. You are asking us to give you a single E-mail to tell you how to do what it took us years to learn. Besides, HOW you do will depend on several factors which we do not know.
  3. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    To issue the permit here, they only required me to specify how many of each type of fixture will be installed. I had to submit a drawing for the septic tank installation, but not the internal plumbing. They are two different departments here (soils and plumbing).

    What you describe, sure would have made it easier for me...

    Thank you for your response.
  4. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    More specifcally, I need to connect the toilet and catch basin (both 3") into the 4" outside line to the septic. Can I connect the toilet and catch basin together via a wye, and have a 3" vent stack up the wall where the line exits the building?

    I believe this would be a short horizontal wet vent for the toilet and catch basin. Is that OK?
    Last edited: Jun 15, 2012
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,480
    Location:
    Cave Creek, Arizona
    In theory, what you ask is okay, but HOW you acutally do it will determine whether it passes inspection or not, and you also have to provide a drain and vent for the sink.
  6. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    I'll provide a drawing showing what I'm planning...

    Thank you for all the help and advice!
    Last edited: Jun 18, 2012
  7. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    Here is a drawing trying to show what I'm considering for the drain and vet connetions.

    Does this look OK and any suggestions to improve it?

    What would be a good way to vent the catch basin?

    thanks


    bath.jpg
  8. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    OK, I think I have something that should work well. Before I cut, glue, and call for an inspetion can somome please let me know if this basic layout and fittings look good?

    The line from the sink will have its own 2" vent raising about 8' then connecting to the roof vent line.

    All waste lines will be sloped at lease 1/4" per foot.

    thanks!

    Tim


    drain1.jpg
    drain2.jpg
    drain3.jpg
    drain4.jpg
    Last edited: Jun 20, 2012
  9. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    After a little more research, I found I can't share the vent between the toilet and catch basin the way I had it.

    This is the layout I'm planning to use tomorrow.

    Please let me know if you see any problems.

    thank you for all the help!

    bathnew1.jpg

    bathnew2.jpg
    Last edited: Jun 21, 2012
  10. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    Got the drains and vents finished and passed inspection so I can get this covered up and the slab poured!

    I have learned a great deal from this site and appreciate all of the expert information that has been generously contributed.

    plumb.jpg
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