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Thread: rough-in sink drain through floor - where/what to cap for inspection ?

  1. #1
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    Default rough-in sink drain through floor - where/what to cap for inspection ?

    I'm doing a kitchen remodel that includes complete re-pipe and new cabinets, sink, etc. The kitchen sink is located on an external wall, under a large 6 foot wide window. Because of the location, I do not want to put the DWV pipes in the wall. I'm planning to put the kitchen sink drain through the floor. See the attached drawing. My question is: How much of the kitchen drain pipe should I put in, and cap off, for my rough-in plumbing inspection? My challenge is that I still have to install the kitchen cabinets after I get the rough-in inspections for plumbing and electrical. Should I just leave a stub of the pipe a few inches above the floor and cap it there? Or would the inspectors want to see the sani-T, cleanout, and AAV I have planned as well? Thanks for your time and comments!

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  2. #2
    Master Plumber-Gas Fitter shacko's Avatar
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    Thats going to depend on your local jurisdiction, you also need to know if an AAV is allowed, if not you will have to run your vent.

    If allowed I would just stub it up thru the floor and cap it,

  3. #3
    One who lurks Basement_Lurker's Avatar
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    If this is being inspected, you better tell your inspector ahead of time that you plan on using a mechanical vent. Those codes which do allow for the use of a mechanical vent only usually make provisions for them to be used in exceptional instances such as an island sink. You can usually divert your stack or vent piping around a window fairly easily, so you better make sure you run your plan by your inspector first.
    Broken promises don't upset me. I just think, why did they believe me? -Jack Handy


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    DIY Senior Member dlarrivee's Avatar
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    Let me get this straight, you have a problem with your drain being inside an exterior wall but you plan on running your pex supplies in the wall judging by the finish boxes you've shown... That's a little backwards in my world.

    Use a proper vent instead of that AAV, those are meant for worst case scenarios, not lazy renovations. Just use a longer trap arm and offset around the window if you must.

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    Yes. AAVs ara allowed here. I've had that discussion with the inspector. They'll let me put this one in and 2 others. Thanks for your comment. Stubbing it up thru the floor and capping it really seems reasonable. Thanks for the comments!

  6. #6
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    Yep. Even sent the inspector detaled drawing of the whole thing - which they don't require but agreed to take a look at before I started this project. No problem with the inspectors or AAVs here ( Washington County, Oregon )

  7. #7
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    This is an old house that already went through many re-pluming jobs. When I got to it, that wall - about 20 feet long with a sliding patio door an 6' window above the sink, had just 1 stud intact supporting the roof load. All of the other had been cut, bored, notched to Smitherines. I had to rebuild the wall. After that, I really don't want to cut big notches/holes, particulary under the window and through the studs supporting the header. I don't mind the PEX because the holes are much smaller, only in the bottom plate, and can route easily into the crawl space. Thanks for the reply.

  8. #8
    DIY Junior Member Sanat Sachdeva's Avatar
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    Quote Originally Posted by Basement_Lurker View Post
    If this is being inspected, you better tell your inspector ahead of time that you plan on using a mechanical vent. Those codes which do allow for the use of a mechanical vent only usually make provisions for them to be used in exceptional instances such as an island sink. You can usually divert your stack or vent piping around a window fairly easily, so you better make sure you run your plan by your inspector first.
    thats right they come with a provision ....ontario plumbing codes say these AAV'S air admittance valves can only be used to vent-a) fixtures in buildings undergoing renovation and b) installation where connection to vent may not be practical....and a few other conditions...

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    Moderator & Master Plumber hj's Avatar
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    quote; b) installation where connection to vent may not be practical....and a few other conditions

    In other words, anywhere, the installer is too "lazy" to install a proper vent. AAVs may solve some problems, but they also can creater others.
    Licensed residential and commercial plumber

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