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  1. Horst22

    Number of toilets on 3" drain

    Hello, I'm getting ready to add a basement bathroom. As far as I know we only have 3" drain lines running under our slab which I had planned to tie into. We already have 3 existing toilets in the house. My question is if I can add a 4th assuming we have a 3" main drain. From what I've read on...
  2. Horst22

    Basement bathroom rough-in prelim layout

    Thank you, this is very helpful. - That was a horizontal dry vent - I will remove that. - I think I am confusing the limits for trap arm length with the total distance from trap to dry vent and why I had that extra vent line there. To confirm my understanding - If I remove what I had for...
  3. Horst22

    Basement bathroom rough-in prelim layout

    Hello everyone, As many others, long time reader, first time poster. I'm planning a basement bathroom and would appreciate some advice on an initial layout of the rough-in. I live in Iowa; code is 2021 UPC. I have done some light plumbing work, but not a project like this (I apologize if my...
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