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  • #31
    Re: back to back toilets

    Originally posted by se215 View Post
    thanks for all your answers so far
    the toilets are regular toilets not pressure assisted or blow out type
    so it seems like the double san tee is better
    A four inch vent is too large, You can vent both toilets with a 2 inch vent. One of the problems will be if you are doing a permitted job it will be best to check with Your Local Plumbing Official due to geographical locations. I will look at your drawing and tell you more. I teach plumbing at night for an Apprenticeship Program. I teach the Florida Plumbing Code...I saw your flat drawing and will suggest that you put a two inch vent on the lavatory and not a four inch. This will allow you to put in a regular 3-5/8's rough wall saving space for your water piping.
    Last edited by OBD; 07-07-2008, 05:11 PM. Reason: Addition of more information

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    • #32
      Re: back to back toilets

      Originally posted by se215 View Post
      here is the drawing from our code book...i had to resize it
      yes in philly we are allowed to use a s-trap
      why wouldnt you be?
      i dont know about the UPC ...i dont do much plumbing outside the city
      and the bathroom on the right will have a lav with its own 1 1/2 stack
      down to the 4" main drain, with a 1 1/2 vent through the roof...its not on the drawing i was looking for opinions on the toilets rough in

      thanks for all your answers
      I teach the Florida Plumbing code which used to be the SBCCI Code (which is now called the IPC or International Plumbing Code) and the reason why using an "S" trap is illegal is because of wicking of the trap. Wicking is a form of Capillary Action. Its like putting a string from the dip of the trap and have it string itself over the weir. Since the waste arm is installed with pitch then it would wick the trap dry by capillary action.
      Last edited by OBD; 07-07-2008, 05:22 PM.

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      • #33
        Re: back to back toilets

        our code does not let us choke the vent ( 4" reduced down to 2")
        if the stack is 4" it must stay 4" all the way through the roof

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        • #34
          Re: back to back toilets

          Originally posted by se215 View Post
          our code does not let us choke the vent ( 4" reduced down to 2")
          if the stack is 4" it must stay 4" all the way through the roof
          What is the dfu count that you guys use. I also think this may be due to the snow you guys get. I think....

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          • #35
            Re: back to back toilets

            we use this table for fixture units (p-904.1)
            Attached Files

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            • #36
              Re: back to back toilets

              Originally posted by se215 View Post
              we use this table for fixture units (p-904.1)
              Our floor Drains have Zero dfu count due to them being used only in an emergency and not as regular used fixture. It also seems that your plumbing board that approves the codes haven't updated to the low flow consumption fixtures, have they? Do you use the low flow fixtures now?

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              • #37
                Re: back to back toilets

                OBD
                Welcome to the wide world of multiple plumbing codes.
                Mike

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                • #38
                  Re: back to back toilets

                  OBD. I must be dyslexic. Everytime I see your name I think of the Wu Tang Clan.

                  J.C.

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                  • #39
                    Re: back to back toilets

                    Originally posted by JCsPlumbing View Post
                    OBD. I must be dyslexic. Everytime I see your name I think of the Wu Tang Clan.

                    J.C.
                    I love my plumber

                    "My Hero"

                    Welcome, Phoebe Jacqueline!

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                    • #40
                      Re: back to back toilets

                      I am at a loss for words.

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                      • #41
                        Re: back to back toilets

                        ODB oops OBD
                        If it makes you feel any better I had to Google "Wu Tang Clan".
                        Mike

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                        • #42
                          Re: back to back toilets

                          ODB: I teach the 2nd year apprentice course up here, IPC. I also hold a Fla. masters license. The Philly code is very different than what most of the country deals with. In fact they even have names for the strange and wonderfull things they allow. Best I can figure is they don't see an s trap on a lav as a problem, because the lav gets used often enough to keep the trap full and the 4" vent probably lets enough air in to keep back siphoning to a minimum. That said, I'll bet that if you could go back in time the real reason had something to do with payoff's and graft
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