Trap arms
Posted by Jeff S. on February 17, 19100 at 17:54:41:
Can a trap arm only run horizontally, or can the same trap arm contain both horizontal and vertical runs before the point where the vent connects? I'm trying to plumb my kithen sink DWV without using an island vent. Although it is not in an island, the sink is against an exterior wall with a window above and I can't run the trap arm through the studs because it would violate the code for boring load bearing studs. So I want to run the trap arm into the exterior wall, down into the crawl space and then over horizontally to pick up a vent in the same exterior wall just to the side of the window. This is new construction. Is what I'm describing permitted? Thank you very much.

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