Double Trapping

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    • #277531
      DiNarda

      I cannot find any reference in NY State plumbing codes that prohibits doubling trapping a fixture or drain…. HELP!!!!!!!!

    • #296481
      DUNBAR
      Participant

      Double trapping is prohibited for the reason that it will slow down water-born debri, thus causing a clog. One trap provides the adequate protection from sewer gases emitting into the free atmosphere.

      Most common mistake DIY’rs make is installing 2 traps under a sink; not code compliant.

    • #296482
      Robert Stephen Morton
      Participant

      Double trapping will also but most impotantly cause a air lock & will not allow the propper function of the sanitary system!!!
      Bob

    • #296483
      Phil_H
      Participant

      Did the state of New York start using the I-codes? IPC 1002.1. I don’t live in IPC land but it is real easy to look up.

    • #296484
      PlumbingInspector
      Participant

      NYS has adopted the ICC codes, bit are creating enhancements to the codes, As far as double trapping the answer is not unless it is an indirect drain over 2 feet in developed length. (indirect drain would require airgap or air break)

    • #296485
      Retired plbg1
      Participant

      Why would you double trap on indirect line, you dont need trap on that line at all except one in hub drain.



      Art retired plbg

    • #296486
      PlumbingInspector
      Participant

      code call for all indirect waste over 2′ in developed length to have its own trap

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