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Thread: Need feedback on sink P-trap below floor level

  1. #16
    DIY Junior Member Buttonsrtoys's Avatar
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    Quote Originally Posted by mikeplummer View Post
    i also agree with Terry regarding the AAV....if it is in the cabinet and above the bottom of the sink, then it is a - accessible and b - if the sink clogs potentially gunking up the AAV it can be removed and replaced or cleaned as necessary.
    does it meet code? - no...is it practical? - absolutely
    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?

    Name:  Simplified Island Plumbing.jpg
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    Last edited by Buttonsrtoys; 11-05-2012 at 04:46 AM.

  2. #17
    DIY Junior Member plmrgrl's Avatar
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    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!
    Name:  island sink.jpg
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    Last edited by plmrgrl; 11-05-2012 at 06:08 PM.

  3. #18
    DIY Junior Member Buttonsrtoys's Avatar
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    Quote Originally Posted by plmrgrl View Post
    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.

    Is my vent-loop design OK?
    Last edited by Buttonsrtoys; 11-06-2012 at 03:49 AM.

  4. #19

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    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

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