Move Kitchen Island vent and drain approx 12"

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by econjon, Apr 3, 2020.

  1. econjon

    econjon New Member

    Joined:
    Sep 18, 2013
    Location:
    California
    I had my plumber rough in the DWV and H2O supply. I now realize it's in the wrong place by about 10-12".

    I know I cannot have horizontal runs in the island DWV loop (at least not below cabinets). Can I 45 the stacks toward where I need them and then 45 back up for the vent loop?

    Picture attached
     

    Attached Files:

  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    45's on the vertical are fine.
    Looks like a nice job on the Island vent.
     
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  4. econjon

    econjon New Member

    Joined:
    Sep 18, 2013
    Location:
    California
    Thanks for the quick reply Terry!

    I just realized that the as I 45 the stack away, the drain outlet height will necessarily increase. By my math moving it over 9" puts bottom of clean-out/drain fittings at 14" off finished floor. Could I swap positions of clean-out with drain to get back some height? Probably not legal. Or is there a clever way to solve this?
     
  5. econjon

    econjon New Member

    Joined:
    Sep 18, 2013
    Location:
    California
    Just a thought. Can I run the drain line laterally after it comes out of floor (with 1/4"/ft) using long 90's and use the 45's on the vent side?

    Pic of idea attached
     

    Attached Files:

    Last edited: Apr 3, 2020
  6. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Yes on the the 90s, and only the left-hand one needs to be long. The one that feeds into the floor could be long or medium.

    Yes on having two 45s above the santee, which bring the AAV back to within 15 degrees of straight up.
     
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  7. econjon

    econjon New Member

    Joined:
    Sep 18, 2013
    Location:
    California
    Thanks.

    Going for broke. Is it legal to run the 1 1/2" vent pipe laterally on the floor as well using 90's instead of 45's for the 9" run?
     
    Last edited: Apr 3, 2020
  8. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    You mean horizontally along the floor? No, a vent pipe can not be horizontal on the story it serves below 6 inches below the flood level of the sink or whatever the venting is for.

    You may mean something else.
     
  9. econjon

    econjon New Member

    Joined:
    Sep 18, 2013
    Location:
    California
    That was the question! Thanks! I'll make it work with the 45's. Just have to cut out a bit of back side of sink cabinet. At present the aav is in the middle of the cabinet where the sink is supposed to go! But there's dead space 9" back in the middle of the island. That's where I'm trying to get the AAV into.
     
  10. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Use 60 degree ells to offset it back. They will not raise it as much as 45s will.
     
  11. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    How about a photo or sketch -- side view approximately.
     
  12. econjon

    econjon New Member

    Joined:
    Sep 18, 2013
    Location:
    California
    The 60's were a good trick. All done. Thanks for all the good advice.
     
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