System Venting Size Required for 3 toilets?

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    • #276386
      Cathrin Kate

      I don’t want to undersize my vent system, but I’m being told that our local code only requires 1-1/2″ for the 3 toilets and sinks I’m installing. Does this seem to be sufficient, or where can I get the specifications to follow?

    • #294045
      Retired plbg1

      Our code says that the vent shuld can be 1/2 the size of the waste pipe. Also you go buy the units. If you have single toilets only it should be ok but if you have a lav. on each one I would use 2″, also you have to have at least 1 3″ vent through the roof. Go buy your code, but if you make it larger thats ok.

    • #294046

      How do I check our state of Ohio code? Yes there is 1 – 3″ thru the roof, and 1 lavatory for each toilet. I set is in the basement, with another set directly above that one, and the third app. 20 ft. away on the first floor.
      Thanks for your help!

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