Need review of a rough plumbing diagram

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by ClevelandGuy, Jul 12, 2012.

  1. ClevelandGuy

    ClevelandGuy Cleveland Guy

    Messages:
    2
    Location:
    Olmsted Twp, Ohio
    Can someone review the attached rough plumbing diagram. Let me know if my pipe sizes are ok, and check my venting. I have no clue how to properly vent, especially with 2 bathroom sharing a wall. Any other suggestions would be great!

    This is for a single story ranch style cottage with a crawlspace with the main drain going horizontal to a septic tank.

    rough_plumbing.jpg

    Any help/advice is greatly appreciated
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,024
    Location:
    Cave Creek, Arizona
    If you intend to acutally install it the way you have drawn it, you are going to a LOT of extra work and expense. But it would be difficult to explain a different way and hope that you would understand and install it that way. You do NOT want to run 3" laterally and the reduce it to 1 1/2" for the sinks. And I would not run 1 1/2" to the sinks in the first place. The same thing with the 4" reducing to 2" for the tubs.
  3. ClevelandGuy

    ClevelandGuy Cleveland Guy

    Messages:
    2
    Location:
    Olmsted Twp, Ohio
    Your feedback is greatly appreciated. Could you suggest an easier way to layout this plumbing based on the constraints of the bathroom floor plan?
  4. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    And your vents on the toilets are wrong. They need to be downstream of the toilets rather than where you show them to protect the toilet traps from being siphoned.

    Tim
  5. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,265
    Location:
    Maine

    Toilet traps are designed to be siphoned and it makes no difference where the vents are except that that no part of the vent can be horizontal until it is 6" above the highest fixture served (the lav's)
  6. timf

    timf New Member

    Messages:
    30
    Location:
    Oregon
    I didn't realize that. Thank you for the correction.
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,024
    Location:
    Cave Creek, Arizona
    The toilet vents are in a proper location, they are just connected horizontally.
  8. Plumber1979

    Plumber1979 Certified Plumber

    Messages:
    16
    Location:
    Ontario
    technically you dont have to ven your toilets if you have both lavs coming off like you do. its called wet venting
    Last edited: Jul 15, 2012
  9. Plumber1979

    Plumber1979 Certified Plumber

    Messages:
    16
    Location:
    Ontario
    thats not right either
  10. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,265
    Location:
    Maine

    Really? enlighten us please
  11. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,265
    Location:
    Maine
    Technically, he's in Oregon which is UPC so given the locations of the fixtures, he will have to individually vent the water closets. If Oregon was IPC then he could get rid of the toilet vents altogether.
  12. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,024
    Location:
    Cave Creek, Arizona
    The vent cannot be horizontal until it is 6" above the "overflow" level of THE fixture, not the highest one.
  13. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,265
    Location:
    Maine
    No, that would be 6" above the flood level rim of the highest fixture served by the branch which in this case is the lav.
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