Shower drain venting
Posted by Rob Guth on November 13, 1999 at 03:26:39:

Take a look at this image and tell he if this a valid venting/drain arrangement for a shower? It's necessary since the vent location is one way, and the stack is the other and there are floor joists that I would rather not notch. Can you vent 'upstream' on a branch drain (the trap arm length in this case is less than 1 foot).

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