(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 13 of 13

Thread: Dish Washer, is an air gap still a requirement?

  1. #1
    DIY Member tom12's Avatar
    Join Date
    Aug 2011
    Location
    California & UK
    Posts
    63

    Default Dish Washer, is an air gap still a requirement?

    I've noticed in another place a claim that there is now, in many states, no code requirement for using an air gap with a dish washer drain. The only requirement now is for a high-loop in the D/W drain pipe. Any comments?

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,202
    Blog Entries
    1

    Default

    California uses the UPC code, which is one of the codes that requires the air gap fitting.
    The best thing would be to call your local inspection office and see what they want.

    We use the air gap in Washington State.



    Last edited by Terry; 11-19-2012 at 09:12 AM.

  3. #3
    DIY Member tom12's Avatar
    Join Date
    Aug 2011
    Location
    California & UK
    Posts
    63

    Default

    Thank you Terry.

  4. #4
    In the Trades Tom Sawyer's Avatar
    Join Date
    Nov 2010
    Location
    Maine
    Posts
    2,940

    Default

    I live in Maine which is UPC and an air gap is required
    In NH (just over the boarder) which is IPC only a high loop is required.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,405

    Default

    The safest connection is an air gap, whether required or not. It's up to you to decide, if you have the choice.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    In the Trades Tom Sawyer's Avatar
    Join Date
    Nov 2010
    Location
    Maine
    Posts
    2,940

    Default

    Modern dishwashers will usually have the high loop already installed on the appliance itself so running another under the sink cabinet effectively double traps the line which is not a good thing.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  7. #7
    Homeowner
    Join Date
    Jan 2010
    Location
    Alabama
    Posts
    1,174
    Blog Entries
    1

    Default

    I installed my dishwasher with a high loop. I heard those sink top air gaps will fail and flood yo kitchen man. Thats a no go. Plus it looks like crap and takes up a hole in the sink. LOL
    I know they have a purpose but I'll take my chances. The last thing I'm worried about is the perfect storm happening and I get sick from how my dishwasher is hooked up.

    I worry more when I go out to dinner. I've worked in all those kitchens every plumber on this forum knows what I'm talkin bout.

    Last edited by Terry; 03-08-2012 at 05:13 PM.

  8. #8
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,641

    Default

    quote; running another under the sink cabinet effectively double traps the line which is not a good thing.

    It is a pumped discharge and therefore it can have as many "traps" as you want to use. Whether an air gap is required or not is usually a local issue.
    Licensed residential and commercial plumber

  9. #9
    In the Trades Tom Sawyer's Avatar
    Join Date
    Nov 2010
    Location
    Maine
    Posts
    2,940

    Default

    It is indeed a pumped fixture but when you double trap it, water stays in the low part of the drain hose which is not a good thing if you can avoid it
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  10. #10
    DIY Junior Member davianmcllm's Avatar
    Join Date
    Mar 2012
    Location
    Douglasville, GA
    Posts
    1

    Default

    First, I want to make sure I'm using the correct terminology.
    The little device that is connected to your dishwasher that sits inline with your faucet, etc. on top of your sink. Usually it has a little metal(or plastic covered with metal) cap on it and it let's air in.
    Second, I understand now that the CA code requires the something, but is there a way to do it differently so that you don't need that ugly little cap, etc. on your sink?

  11. #11
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,405

    Default

    If your local code requires one, you need one. Haven't really looked into styles of what's available. It doesn't have to be installed on the sink deck, it can be anywhere on the counter but that requires an additional hole.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  12. #12
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    Quote Originally Posted by jadnashua View Post
    If your local code requires one, you need one. Haven't really looked into styles of what's available. It doesn't have to be installed on the sink deck, it can be anywhere on the counter but that requires an additional hole.
    But, THAT does open you up to the potential flood in the event of a backup. That is not something that should ever happen...but we know that things sometimes DO happen.

  13. #13
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,202
    Blog Entries
    1

    Default

    Modern dishwashers will usually have the high loop already installed on the appliance itself
    And yet not all modern dishwashers have that. Sue's home had a new kitchen remodel, stainless appliances including dishwasher. She often had murky water in the dishwasher, sometimes enough to spill out the front when the door was opened. She had no "high loop" and no "air gap".



    The dishwasher was installed to the disposal, and the disposal had been plumbed without a p-trap. Wow! A complete kitchen remodel and they installed the new granite countertops with stainless undermounts without an air gap or a p-trap. Pretty gross!



    I went ahead and pulled the old antique disposer and installed a quiet Evolution disposer. Moved the drain in the wall and made sure that the disposer was now trapped before making it's way down the drain. The dishwasher now drains with an air gap on the counter top, and the bottom of the dishwasher is now clean, not murky. While I was at it, I added a frostfree faucet for watering outside to the piping under the sink.
    It's always better with an air gap!


Similar Threads

  1. Using Dish Soap for Bugs
    By DonL in forum Lawn Care/Landscaping
    Replies: 29
    Last Post: 05-10-2011, 10:21 AM
  2. Proper Drain / vent setup for Dish Washer
    By jamiedolan in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 10
    Last Post: 03-09-2009, 08:49 AM
  3. direcTV Sattelite dish mount
    By DIY in forum Electrical Forum discussion & Blog
    Replies: 12
    Last Post: 04-15-2008, 02:11 PM
  4. Installing new soap dish into existing ceramic tile
    By bbbluueyes in forum Remodel Forum & Blog
    Replies: 4
    Last Post: 01-09-2008, 05:08 AM
  5. Portable dish washer conversion
    By buildumup in forum Remodel Forum & Blog
    Replies: 3
    Last Post: 01-28-2006, 10:05 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •