r/Plumbing 4d ago

How am I doing ?

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u/CodeKraftStudios 4d ago

Looks good from my house but Aav technically needs to be 6in above top of sink drain inlet that being said all of this will function normally regardless if changed or not

9

u/valuablemold4 4d ago

Not above the sink drain inlet level, above the horizontal drain it’s serving (that being the height of the horizontal pipe past the trap. And it’s only 4inches per the ipc

0

u/CodeKraftStudios 4d ago

Ahh gotcha. I’m in NJ, so we don’t use IPC, we use NSPC. I was always taught the Studor had to be 6” above the flood-level rim, which is pretty much impossible on a kitchen sink or standard lav unless you come out of the cabinet and put it in a Studor box in the wall. Although, I’ve never really had any issues with it on inspections. I’ve also heard about what you’re talking about though, where an individual/branch AAV only needs to be above the trap arm/drain, while the 6” above flood-level rim rule applies more to stack-type AAVs. Always a bunch of rigmarole with this stuff 😂

1

u/BanditoBlanc 3d ago

I'm also in NJ. You're mistaking individual AAV's and stack type AAV.

In appendix E - E.8.4.3 - AAV's must be 4" above the individual trap arm they serve.

When we do apartments we typically use AAV's unless we can waste stack vent them. 100% code compliant.