New 10" deep sink - now waste drain too high! options?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by dianelouise, May 18, 2010.

  1. dianelouise

    dianelouise New Member

    Messages:
    11
    I'm trying to see if I can avoid opening up the wall to lower the drain - dear hubby is traveling for 3 weeks and I want to avoid calling a plumber if I can help it. Our budget is already blown to bits!

    I have a new 10" deep undermount sink - not installed yet. Cabinets not installed yet. Waste drain is 8" below the bottom of the new sink. Garbage disposals suggest drain be 10" below new sink. Most disposal outlets are about 6-7" below the top - and then there is a 4" tube that goes down (black in attachment) - to which a P-trap is attached and run into the drain in the wall (white in attachment). Is there some sort of a P-trap that would not require the 4" downturning tube?

    Thanks for your suggestions... just trying to save my hubby from having to open up the wall!

    Attached Files:

  2. dianelouise

    dianelouise New Member

    Messages:
    11
    I found a diagram from another thread - I think I will be ok! As long as the wall drain is below the disposal outlet (ours will be about 1" lower) I can make the plumbing work. In this diagram, the disposal outlet goes straight to a P-trap and then into the wall - I think that is what I will do too! Do you agree?

    Attached Files:

  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    Save yourself grief, and cut the wall now.
    If the pipe goes down, you can lower the tee.
    If the pipe goes sideways, you will need to get a 1/2 hp drill and relocate the drain about 3" lower.
    If you don't, you will always have standing water in the disposer.

    You're not the only one this happens too. At least you caught it in time.

    Normally on a 10" sink, the waste needs to be 16" from the floor.
    I don't know why professional kitchen remodel contractors fail to know this.
    It's much easier to fix this before the new cabinets are installed.
  4. dianelouise

    dianelouise New Member

    Messages:
    11
    I looked at the wall (drywall is still on) - and it looks like the drain runs sort of horizontal to a Johnson T about 3 studs away. We would have to move that entire section of drain down and replumb the Johnson T. Also, there is electrical running below that drain that would probably have to be moved as well. If the disposal outlet is 1" higher than the wall drain outlet, won't we be ok? If not, a new sink that is only 9" deep would be cheaper!
  5. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    It's about getting the p-trap to connect up, those determine some of it.
    For a plumber to move the plumbing, then yes, it would save you to get a shallower sink. I'm not sure that 9" is going to work either though.
    I would feel better about 8"
  6. dianelouise

    dianelouise New Member

    Messages:
    11
    Ok, thanks for the input. I guess I'll start shopping for a sink. I'm thankful to have discovered this now rather than later.
  7. ilya

    ilya In the Trades

    Messages:
    105
    Location:
    Akron Ohio
    This very thing happened to my inlaws. The sink and countertop installers (from a big box store)put in a trap with a flexible accordion outlet. With the new deeper sinks it was 2" too high and the end outlet pipe and disposer had water in them all the time. I took pix w/ my phone and raised Holy Sam at the store. They gave me the parts to fix it myself. And of course, the drain went sideways! Good job catching it before hand Dianelouise!
  8. Esquire

    Esquire Plumber

    Messages:
    65
    Location:
    Newfoundland
    or you could always throw out the disposal

    I think most people, I'm sure people in my house would too, use them incorrectly and they cause more maintainence issue down the road than they are worth.
    Chuck the disposal reand keep the sink. All the problems solve.

    I hope this doesn't come across as too mean... Had the others not given viable solutions I wouldn't have just replied with a bash response.
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