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Old 10-07-2012, 09:16 PM   #1
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'S' traps

A day late and a dollar short, but I'm just discovering that 'S' traps are not the going thing.

For work already done that's committed to 'S' traps, if the vent line taps off on a reverse running 'T' just below the trap, any reason to believe that it won't work just fine? Right now, it's only one bathroom that would include a sink and shower with this design. The second bathroom follows, and obviously I'll have to do my homework better on that one.

As usual, any help is greatly appreciated.



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Old 10-08-2012, 06:19 AM   #2
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I see you're in Missouri, so probably don't have any building or plumbing codes to worry about. While S traps have not been legal for a long time, that does't mean they don't work. Try your setup for a while. If it works, fine. If it doesn't, tear it out and use P traps.


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Old 10-08-2012, 10:10 PM   #3
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S traps will siphon it self dry thus breaking the water seal.

Experience is Knowing what to do next, Skill is knowing how to do it

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Old 10-09-2012, 04:40 AM   #4
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If the last part of the S trap (the part going down into the floor) is larger than the trap than there is less of a chance of getting a vacuum and causing a siphon on the trap. 2 drain pipe with 1.5 S trap.
I have seen a few times where someone put a 8 section of 2 pipe against the S trap to help eliminate the siphon and worked part of the time.
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