What is the drain height for a kitchen sink?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by WorthFlorida, Mar 21, 2012.

  1. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    I looked all over and I've read as low as 12" to high as 18" off the finish floor. The counter height is 36" the sink bowl will be 8 or 9 inches deep plus an in-sink-erator disposal. So what is the best height for the drain line coming out of the wall? Also, is the measurement to the center line of the pipe?
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    It depends on the model of the disposal. What you don't want is the connection in the wall to be higher than the outlet of the disposal...it must be lower so that after you make the connections, after the trap, it can still slope down to maintain flow properly. Too low would be more than 24" below the outlet of the disposal.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. Hackney plumbing

    Hackney plumbing Homeowner

    Joined:
    Jan 6, 2010
    Location:
    Alabama
    I hit mine at 14" from the slab. Yes thats to the center.
     
  5. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    !2" will work, but it is a bit low. 18" would be tight for a deep sink. I do mine 14" -16" high. As a practical matter, it is almost impossible to install it too low, unless you get ridiculous and put it at the cabinet floor, but very easy to get it too high.
     
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    The arm from the trap must slope down. There's a limit on how high you can make the trap fit because from the outlet of the disposal, it must also slope down. So, the limiting thing is at what level the outlet of the disposal is. Then, consider you will eventually need to replace that thing, and the new one may be deeper/lower (as could be a remodel with a new, deeper sink). As said, you don't want it too high. Lower just ends up taking cabinet space, but constantly knocking the pipes probably isn't a good thing either. But, lower is easier to ensure you can install things properly, since gravity wins, you can make it work.
     
  7. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    With the new stone counters and undemount sinks, I do 16" or lower.
    I've seen way too many kitchen remodels where nobody called the plumbers in until they were done.
    Old homes without disposers used to be at 21" and in the mid 70's it was 19" for a disposer.
    With the new deep sinks, 16" would be the highest I would ever use.
     
    breplum likes this.
  8. Tuttles Revenge

    Tuttles Revenge In the Trades

    Joined:
    Oct 15, 2014
    I always measure from the top down for sink heights. If your typical cabinet starts at 34.5" but depends on if its sitting on the finished floor or rough. Undermount sink drops 10" to the underside. Disposal with a continuous waste adds 7-9" (9 gives some wiggle room and you don't have to cut the continuous waste). That puts my typical kitchen sink stub out at 15.

    The contractor I work with the most uses roll out shelves under most of their sinks, so just going low isn't an option.
     
Similar Threads: drain height
Forum Title Date
Plumbing Forum, Professional & DIY Advice Bathroom vanity remodel: drain and supply line heights Jul 18, 2020
Plumbing Forum, Professional & DIY Advice Kitchen sink drain height problem Apr 7, 2020
Plumbing Forum, Professional & DIY Advice Wall mount sink drain height help Feb 16, 2019
Plumbing Forum, Professional & DIY Advice Basement bathroom questions -- minimum height and main drain Dec 23, 2018
Plumbing Forum, Professional & DIY Advice Height of rough in drain pipe for bathroom sink Nov 30, 2018

Share This Page