I am installing a new shower in an upstairs attic. I am taking part of a downstairs closet for a chase wall to run the plumbing and electrical. The closet is 10' from where the shower drain will be located. Rather than pull up good hardwood floor or tear out a plaster ceiling, I plan to push the drain line under the floor from the attic space near the closet. I would like to locate the trap in the closet as that would be easier than pushing the trap assembly the 10' to the shower; not to mention that I am limited in the space between the floor and ceiling below.

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    Traps are supposed to be directly below the fixture outlet. 10 feet is too long even for a trap arm, the vent take off will need to be much closer to the shower.
    – bcworkz
    Feb 16 '14 at 17:56
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    @Bcworkz, you got that right, I had to look up the vent requirements for a job I am doing. Code requires the vent to be no farther than 6ft away from the drain opening.
    – Jack
    Feb 17 '14 at 0:47
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    Are you saying the space between the floor and the ceiling is not large enough to accommodate a trap? If this is the case, the joists are probably not large enough to support livable space.
    – Tester101
    Feb 17 '14 at 11:50
  1. If a 3" pipe is run to a 2" trap the pipe is sufficiently oversized to be considered self venting.
  2. A running trap may be used remotely which uses less space at the shower drain.
  3. To answer the original question, I don't know the distance to trap max but it depends on the piping size.
  • In what plumbing code is self venting and running traps allowed?
    – bcworkz
    Mar 14 '14 at 18:44

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