Main Sanitary Stack Code Question
I am working on a fairly significant project (3 1/2 bathroom remodel).
I need to move my main sanitary stack. I've eliminated all of the fixtures and branches that tied into it.
All of my fixtures are vented individually. If I read the Illinois plumbing code correctly, I still need a main stack to my house that is at least 3" in diameter EVEN if I all of my fixtures are vented individually.
Am I reading the code correctly? I'm wondering why I need a separate main stack if all of individual branches are and fixtures are vented separately.