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trap arm length


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I know the limit for vertical trap arms is 24" prior to the trap under a sink. How about a shower in a basement? Can the drain pipe do a 90 then travel horizontally farther than 24" before dumping into a trap? I'm used to seeing the trap directly under the shower but recently I saw one do a 90 and off to who knows where.

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In the UPC, the 24-inch rule applies to traps on all fixtures, not just sinks.

I don't know about horizontal distances before you get to the trap. That doesn't seem to be addressed for a single fixture, but I'd think you'd want it to be as close as possible to the fixture.

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  • 2 weeks later...
  • 2 weeks later...

Is it going into a p trap or an s trap? If its going into a p trap Id probably consider that to be a running trap,which we arent allowed to use around here for maintenance reasons.

We arent allowed to use s traps in omaha area,but certain upc areas might be more forgiving.

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