W/C DFU question

Discussion in 'UPC Plumbing Code Questions' started by Mr. Larson, Nov 10, 2011.

  1. Mr. Larson

    Mr. Larson New Member

    Messages:
    1
    Location:
    Everett, WA
    So, I have taken my residential test twice now, and I failed! I have done well on everything but the waste and venting portion. I am beginning to believe there is something I'm just not getting, or maybe there is a sneaky trick to the test. Anyways, I would like to know how many 1.6 gravity tank toilets can be put on a 3" drain, (private/public)... and how many flushometer valve toilets can go on a 3" drain, (private/public).
  2. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Messages:
    1,143
    Location:
    South*East
    I believe the answer to both is two on a horizontal and three on a vertical drain.

    John
  3. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    I believe the answer to both is THREE, from table 7-5
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,614
    Location:
    Cave Creek, Arizona
    Three toilets, of any kind, on a 3" line. A fourth toilet requires that it be increased to 4" FROM that point on. However, if this is per the IPC then the answer could be anything, depending on the cheapest way to install it.
  5. Winslow

    Winslow Plumber

    Messages:
    450
    Location:
    Hawaii
    three on a horizontal line and 4 on a stack, according to the UPC
  6. mtcummins

    mtcummins In the Trades

    Messages:
    380
    Location:
    Pittsburgh PA
    Well I think its 4 and 4.

    Haha, no its not. Just amused that every post was a different answer. Pretty sure that 3 on horizontal 3" line is correct, but I have no idea on a vertical/stack. If I remember right, this horizontal setup would require one 2" vent between the first (furthest from stack) and second toilets, but I could be wrong (pros, please correct me if I am). I don't ever deal with situations like that, all my multiple toilet situations are stacked vertically (we city people build up, not out :p )
Similar Threads: question
Forum Title Date
UPC Plumbing Code Questions Curb height question Jun 28, 2014
UPC Plumbing Code Questions Washing Machine Draining Hose Question Oct 19, 2012
UPC Plumbing Code Questions drain slope question - UPC May 11, 2012
UPC Plumbing Code Questions trap arm question, UPC May 30, 2010

Share This Page