My in-laws have a "island" like sink and no direct vent stack (inverted U system). It works OK, but after decades (sink with garbage disposal/etc.), sludge and slime did build up in the piping (brother-in-law had to replace the piping when leaks started--just followed the existing design--and I had to snake out the system at times (sewer continues to a wet bar sink 20 feet away).
-Bill
Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
My AHJ is a stickler so maybe no AAV. How about cutting the vent pipe down to about 3" above roof and a few inches below the array. I really don't want to checkerboard the array or add the expense to the customer to move the vent.
In my area the vent pipes need to exit the roof with 3” pipe minimum and 18” off the roof . It’s no big thing to move the vent up to the ridge on the inside and pop out above the array .
40 bucks and a hour of time it seams like a no brainer
Out back flex power one with out back 3648 inverter fm80 charge controler flex net mate 16 gc215 battery’s 4425 Watts solar .
Comments
However, like everything these days there is a law (code) about this stuff:
https://www.carsondunlop.com/training/resources/waste-plumbing-air-admittance-valves-and-automatic-air-vents-part-one/
https://www.carsondunlop.com/training/resources/waste-plumbing-air-admittance-valves-and-automatic-air-vents-part-two/
One typical issue with venting are kitchen islands with sinks. Obviously you don't want a vent stack going up from your island to the ceiling.
https://www.familyhandyman.com/kitchen/how-to-plumb-an-island-sink/
https://www.finehomebuilding.com/2019/09/10/a-new-old-way-to-vent-a-kitchen-island
My in-laws have a "island" like sink and no direct vent stack (inverted U system). It works OK, but after decades (sink with garbage disposal/etc.), sludge and slime did build up in the piping (brother-in-law had to replace the piping when leaks started--just followed the existing design--and I had to snake out the system at times (sewer continues to a wet bar sink 20 feet away).
-Bill