Thanks guys. I appreciated the feedback. I'm leaning toward the AAV route. There's one optional scenario that just occurred to me that I'd like to run by you. I have enough room in the wall behind the sink loop a vent 1/2" or so over the flood level of the sink before it dives under the floor. The picture below shows what I mean. It's similar to plumbing for an island, but I'm thinking it could be simplified a bit since the vent loop gets above the flood level, so there's no risk of it flooding. I would slope the vent towards the stack, rather than the fixture. Is this a good, Canadian code compliant option?
Originally Posted by mikeplummer
I hope you haven't started on your sink yet!
This is straight from the National Plumbing code of Canada (2005) in the appendix
The only thing I might tweak on it would be to add a back vent- depending if anything was coming down the stack from above. Good luck!
Thanks for the clarification! Unfortunately, I started. I have the drain portion installed and was about to put in the AAV when it occurred to me that I could run the vent loop above the flood level. Its just as well. The trap wasn't as accessible from below as I thought.
Originally Posted by plmrgrl
Is my vent-loop design OK?
is should be ok as long as theres no dips or low spots in the vent portion that could collect water...also go as high as possible(within reason ex.6"-8") above the flood level of sink with your loop...also you need to install a cleanout downstream of the trap or use a union p-trap