Double sink / Disposal / Dishwasher - old home renovation advice needed

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by k.k., Jan 9, 2012.

  1. k.k.

    k.k. New Member

    Messages:
    10
    Location:
    Philadelphia PA
    Hi -

    I'm getting ready to do the plumbing for my kitchen remodel and had a question regarding the drain line for a Double sink / Disposal / Dishwasher

    Currently drain goes through the floor in the basement where it is tied into 4" cast that goes into the masonry foundation. No Vent :(

    I was going to do an S-trap but after reading other posts on this site, it seems that is not the way to go. Does anyone have any recommendations for what I can do without adding a vent line that would extend through the roof? My first guess was that I could design it with a P-Trap according to the diagram that Terry has posted in other discussions... Then instead of a vent line above the p-trap, i would have an Air Admittance Valve. Would that be an appropriate solution?

    [​IMG]

    Thanks!

    Ken
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,929
    Location:
    Bothell, Washington
    As long as you have the plumbing system vented through the roof, then you could use an AAV on the kitchen sink.

    [​IMG]
    Last edited: Jan 9, 2012
  3. k.k.

    k.k. New Member

    Messages:
    10
    Location:
    Philadelphia PA
    thanks. Unfortunately I don't think this portion is vented through the roof. From what is could see, it was tied into the drainage system for the downspouts :confused: The downspout drain on the one side of the house seems to enter the basement and then is taken across the basement to the foundation wall on the other side - Where the kitchen drain is then tied into it. So confused - this situation is isolated to the kitchen. The bathroom has it's own section on the far end of the basement 20 ft away, where it enters the foundation (vented system)
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,525
    Location:
    Cave Creek, Arizona
    Your description is confusing enough that we cannot tell if an AAV would be appropriate or not.
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