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Good to know! Thanks for clearing that up Wayne. The tubs and showers are on a separate waste and vent stack.

Thanks John and Terry. I was really just wanting to make sure that I could do that horizontal offset for the attic waste line. I really appreciate the advise and confirmation!

I think the full diagram would look something like this

Thanks for the quick reply! So are you saying the attic bathroom can’t use the offset into the top of the double wye as waste flow? I need to get the waste down the offset. I can add another vent just before the long sweep to horizontal on the offset if that solves the issue. Both the lav and...

Hi everyone. I’m new to this forum and DWV plumbing so sorry if I make a fool of myself. I am currently in the process of remodeling a bathroom and adding another in the finished attic. I will be removing the cast pipe and replacing with PVC. The space is pretty small so I had to get creative on...