DWV Layout - Please Review

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by sjsmithjr, Dec 12, 2005.

  1. sjsmithjr

    sjsmithjr Geologist

    Messages:
    295
    Location:
    Knoxville, Tennessee
    Budget overuns on a house my wife and I are renovating are making it neccesary for me to do something I haven't done in a looong time - install a dwv system. Heck, even when I was doing it it was under the watchfull eye of a master!

    The major code where I'm at is the Southern Building Code. Hopefully the attached image of my poorly drawn isometric drawing is understandable. The drawing can also be viewed by following this link DWV Layout

    Although you can't tell it from the isometric, the wyes on the horizontal are on their side.

    Thanks in advance.

    -Sam

    Attached Files:

    • dwv.zip
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  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,412
    Location:
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    That would work with the UPC code.
  3. dubldare

    dubldare Plumber/Gasfitter

    Messages:
    286
    Location:
    MN/ND
    Before I could fully comprehend it, a wise plumber told me... "Go to your vent first."

    Piping in this way will eliminate the unwashed, flat water closet vent.


    [​IMG]

    Attached Files:

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      dwv.jpg
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  4. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    I was taught that if you can, head for the water closet first. Doing it that way usually a bathroom can be plumbed and vented off of the lavatory only (as long as the wc isn't flushing past the shower of course).
  5. Cass

    Cass Plumber

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    5,980
    Location:
    Ohio
    No message
    Last edited: Dec 13, 2005
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,237
    Location:
    Cave Creek, Arizona
    drains

    [​IMG]

    All the previous comments are correct. My only addition is that what you call a "Y" is probably a combination Y-1/8 bend from the way they are drawn.
    Last edited by a moderator: Sep 15, 2007
  7. sjsmithjr

    sjsmithjr Geologist

    Messages:
    295
    Location:
    Knoxville, Tennessee
    Comments

    Thanks to everyone for their comments and suggestions. Of course, I liked Terry's "that would work" best!

    What dubldare is suggesting makes sense, and I'll change the way I plumb the drain at the water closet.

    I've run drains the way FloridaOrange suggests; somewhere along the way I picked up the idea that individual drain runs to the horizontal work better in the long run. Follow up comments on the merits of either approach would be appreciated.

    Finally, my drawing must be as bad as I thought. I wasn't planning on using combo wyes on the horizontal. Instead, I was going to rotate the long sweep 90s 45 degrees.

    Again, thanks to everyone.

    -Sam
  8. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Wish you well on your project. I'm in S.Florida, everything is run as shallow as we can, most times backventing wc's (or showers) isn't real practical. I was just indicating the way I would have approached it but anyway that keeps your fixtures vented will work.
  9. sjsmithjr

    sjsmithjr Geologist

    Messages:
    295
    Location:
    Knoxville, Tennessee
    You're absolutely correct, FloridaOrange. If I had limited altitude or were building slab on grade I'd definately take your approach. Guess I'll head over to the house now to see what cost overuns, I mean problems, the carpenters have found today.

    Thanks again to everyone.

    -Sam
  10. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,237
    Location:
    Cave Creek, Arizona
    Finally, my drawing must be as bad as I thought. I wasn't planning on using combo wyes on the horizontal. Instead, I was going to rotate the long sweep 90s 45 degrees.

    In that case the lines to the long sweeps should have been horizontal rather than on a slope. In any case, I will try to arrange my systems so as much as possible connects to a single point. Which in your case would mean the toilet would go into a sanitary tee with a left hand inlet. The shower would go into that, which means it would not need its own vent, and the lavatory would arm over to the toilet's vent, so it would not need a vent either.
    Last edited: Dec 15, 2005
  11. sjsmithjr

    sjsmithjr Geologist

    Messages:
    295
    Location:
    Knoxville, Tennessee
    Revised DWV Layout

    Thanks guys. I believe the consensus is that my bathroom dwv layout should look more like the attached drawing. Much simplier and easier to install!

    -Sam

    Attached Files:

    • dwv.jpg
      dwv.jpg
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  12. dubldare

    dubldare Plumber/Gasfitter

    Messages:
    286
    Location:
    MN/ND
    As long as no offsetting of trap arms beyond the 90 degrees shown, and maintaining adequate trap arm distances, you'll be fine in the situation shown.
  13. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,237
    Location:
    Cave Creek, Arizona
    design

    The "KISS" philosophy works in plumbing just as good as it does in computers.
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