Double Trapping

[DiNarda]

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

[DUNBARParticipant]

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.

[Robert Stephen MortonParticipant]

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

[Phil_HParticipant]

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.

[PlumbingInspectorParticipant]

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)

[Retired plbg1Participant]

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

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Art retired plbg

[PlumbingInspectorParticipant]

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

[Author]

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