I have back to back bathrooms and need to figure out how I can plumb toilets to code in KY. I want to keep the main line up in the joist space so I can finish the ceiling in the basement. The inspector said I can use a double cross tee but if when I add a 90 at the bottom and need to 1/4' fall 20' away this will put line below bottom of joist. I was wondering if I could connect to main line horizontally. Can vents be in main line?
Thanks,
Tom
Thanks,
Tom