My stack or vent pipe is at corner of down stairs bath. I want to install bath up-stairs at center of house.I would run drain down through old chimney access & 14 ft. to exesting drain in basement. The pipe I run down will that go up through roof as vent, also will tie in sink to vent. Hope you understand my question... Brad1

Hi Brad

What is question?

Chuck

No problem with extra vents for your new bathrooms. In fact, in my area we run several vents through the roof per house - usually one 2" vent for each bathroom group.