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

    Joined:
    Jul 11, 2012
    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

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    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. Sponsor

    Sponsor Paid Advertisement

     
  4. ClevelandGuy

    ClevelandGuy Cleveland Guy

    Joined:
    Jul 11, 2012
    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?
     
  5. timf

    timf New Member

    Joined:
    Nov 2, 2011
    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
     
  6. Tom Sawyer

    Tom Sawyer In the Trades

    Joined:
    Nov 29, 2010
    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)
     
  7. timf

    timf New Member

    Joined:
    Nov 2, 2011
    Location:
    Oregon
    I didn't realize that. Thank you for the correction.
     
  8. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    The toilet vents are in a proper location, they are just connected horizontally.
     
  9. Plumber1979

    Plumber1979 Certified Plumber

    Joined:
    Jul 15, 2012
    Occupation:
    Certified Plumber
    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
  10. Plumber1979

    Plumber1979 Certified Plumber

    Joined:
    Jul 15, 2012
    Occupation:
    Certified Plumber
    Location:
    Ontario
    thats not right either
     
  11. Tom Sawyer

    Tom Sawyer In the Trades

    Joined:
    Nov 29, 2010
    Location:
    Maine

    Really? enlighten us please
     
  12. Tom Sawyer

    Tom Sawyer In the Trades

    Joined:
    Nov 29, 2010
    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.
     
  13. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    The vent cannot be horizontal until it is 6" above the "overflow" level of THE fixture, not the highest one.
     
  14. Tom Sawyer

    Tom Sawyer In the Trades

    Joined:
    Nov 29, 2010
    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.
     
Similar Threads: Need review
Forum Title Date
Plumbing Forum, Professional & DIY Advice Novice...need some advice...loud screeching toilet Aug 25, 2015
Plumbing Forum, Professional & DIY Advice confused, need possible reasons Aug 19, 2015
Plumbing Forum, Professional & DIY Advice Need Help w/ Waste Arm Aug 5, 2015
Plumbing Forum, Professional & DIY Advice Very plugged condensate line, need expert help. Jul 29, 2015
Plumbing Forum, Professional & DIY Advice Need to move basement shower drain a half inch over into place Jul 25, 2015

Share This Page