Kitchen drain line??

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    • #276206

      I am redoing my kitchen. I will add a dishwasher next to the sink. Currently there is no dishwasher. I will also add a garbage disposal to the single bowl sink. I currently have 1 1/2″ copper drainline. The city plan checker told me since I was adding the d/W, I have to put in 2″ drainline. I was going to do that but when I crawled under the house, I found that I have 1 1/2″ pipe all the way to the main soil stack, which is cast iron. I 2″ drain required by code? Can I argue with the city? I’d hate to have to re-plumb my entire drain system to do this. Any help is appreciated.

    • #293627
      Retired plbg1

      You will have to go with your local code, have him show you where it is in the code.In our code it calls for 2″ when dw & GD is used. They go by fix. units.

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