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Thanks for all the replies...

Thanks for all of your help...I guess I am still slightly confused here...Since everything currently is using the top of the main stack as its vent off the second floor roof (everything including first floor powder room, second floor bathroom, and first floor laundry, and kitchen sink), I can...

From what I can tell everything is wet vented to the main stack. I just want to seperate the first floor powder room and the laundry room to a dry vent out of the first floor roof (these will still be wet vented to the main stack with the second floor bathroom).

But it is ok to have the second vent lower than the first on seperate roofs, even if it is lower than the second floor toilet? O, and thanks for the quick reply!!

Hello, I am new to this forum and have been searching for days now for an answer to my problem online. Short of having a plumber come out to just give me the answer I need I thought I would try this. I understand the concepts of plumbing as far as p-traps and such but I am totally confused...