This is for a second floor bath. The 2"(after wye) and 3" drain lines will run parallel and inside a single joist bay before turning down at the left hand wall. Due to framing and window placements and existing vent locations, running a lav vent through the roof would be more difficult. This is my current plan:
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This is in Maine, and so under IPC. I have the AAV for the LAV in the design to help let some air in behind a slug. Is it overkill with the atmospheric...
Another venting question
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