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I will be attaching 1-1/2" vent line from 4 different fixtures (shower, tub, 2 sinks) in the unfinished ceiling above bathroom and also if I can still use it as my main soil stack (2 inch) to protrude through the roof.

  • Feel free to edit and improve your Qs and As (and those of others) on SE. – isherwood Jan 24 '19 at 16:20
  • I thought you needed a 2” vent for a tub/shower. – Lee Sam Jan 25 '19 at 0:31

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