S trap question

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Interlodge, Jul 24, 2009.

  1. Interlodge

    Interlodge New Member

    Messages:
    28
    I am always coming across a lot of posts on S traps. I was reading the NJ code (national standard plumbing code) on something else and came across this under Prohibited traps......S traps of uniform internal dimensions.
    Later in the venting section it referred to "vents may be connected below the top weir of the fixture trap if the following conditions are met
    1. vertical section of drain pipe is at least one size larger than trap inlet size.
    2. the horizontal pipe connected to the trap outlet shall be at least 2 pipe diameters long.
    3. The developed length of the trap arm shall not exceed the normal table.

    Does that sound like a somewhat modified s trap is allowed?


    Also came across the requirement that a 1/1/2' drain is suitable for a shower stall served by one shower head, 2" if multiple heads.

    This is the 2006 code taken from the NJ state website.
  2. Zenman

    Zenman New Member

    Messages:
    58
    Location:
    New Jersey
    I don't have an answer to your question, but see you said you are going by "NJ code (national standard plumbing code)". I'm a DIYer in NJ and did some work years ago (2002-2003) and my town told me to go by UPC. Now I'm starting work again (new bathroom)... I assume I'm still under the UPC. Of course I think each town could supersede the states requirements. Since you brought this up, I'm going to double check with my town and see which code they will be inspecting me on this time. :eek:
  3. Interlodge

    Interlodge New Member

    Messages:
    28
    My town isn't very strict. I asked about codes, especially any special codes and they said they had none, just the states. On one project that I got a plumbing and electrical inspection on they hardly looked at anything, one of them didn't even go up the stairs to see work on the second floor, he asked one question and handed me an approved sticker. It was a large complicated project and included an Ac compressor and AH to serve the addition and they didn't even look at the breaker box connections
    I certainly want to and try to insure that I meet any codes but I have to rely on myself and my understanding as they aren't even helpful with a planning question. Either way (planning or inspection) I can't rely on them.
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    After the recent news, it sounds like a couple of bucks would solve your inspector problem in New Jersey!

    Couldn't resist that.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,251
    Location:
    Cave Creek, Arizona
    inspection

    From the previous post, it appears you do not even need a couple of bucks. That code provision does appear to have been created to allow "S" traps by installers who cannot figure out the right way to do it, but that does not mean it is a proper way, although in MOST situations it should work. In fact, the longer the horizontal branch is before dropping vertical, the less likely it is to cause problems.
Similar Threads: trap question
Forum Title Date
Plumbing Forum, Professional & DIY Advice, Tips & Residential trap primer question Jun 5, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Question on P Trap. S trap for kitchen Feb 12, 2014
Plumbing Forum, Professional & DIY Advice, Tips & p trap plumbing question. pic included. Dec 20, 2013
Plumbing Forum, Professional & DIY Advice, Tips & Stupid newbie P-Trap question Sep 28, 2013
Plumbing Forum, Professional & DIY Advice, Tips & P-Trap to vent minimum, Weir to Vent question Aug 23, 2013

Share This Page