Another venting question

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BrockHouston

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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:
upload_2021-4-13_11-34-59.png
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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 vent across the room ( 8x8 small bathroom )? Also, am I correct to put the 3x3x2 wye flat since it is wet venting the W.C - even though IPC doesn't require W.C. to be vented? I plan to develop about 4 feet of length in the 3"W.C. to wye connection to promote a strong scavenging on flush. Any constructive ( or funny ) criticism is appreciated.

Brock
 

Jeff H Young

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I think that will pass . and I'm sure it will work fine though only recommending if legal. in addition I prefer 2 inch to the lav through floor to your santee vent take off. 3x3x2 wye flat is best
 

BrockHouston

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I think that will pass . and I'm sure it will work fine though only recommending if legal. in addition I prefer 2 inch to the lav through floor to your santee vent take off. 3x3x2 wye flat is best

Thanks. I'll switch to 2" from lav santee as you suggest.
 

Jeff H Young

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I wouldn't change work already done but basically don't glue that bushing in just continue 2 inch. 1 1/2 is ok for a lav we just 90 percent of time run 2 in unless its going to be more work
 
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