The house is 2 stories. I also have a full basement. I have a bath in the basement, one on the first floor, and 2 baths in the 2nd floor. I was wondering if I needed more than one vent? All of the bathrooms are on one side of the house except for my half bath on the first floor. The house is 30'wide. Will I need to run a seperate vent for this bath? Or can I tee of the main stack and run a pipe through my attic to tie that bath into it?