Hello everyone! New to the forums to ask the opinion of those who know more than me when it comes to plumbing. I have lived in my house for just over a year now, and I knew going in that the plumbing would need a complete overhaul soon, it is currently a mis-mash of rolled copper, PVC, CPVC, Black Flex Hose, Cast Iron and Galvanized Steel. I was looking to replace the whole kit and caboodle with Hard Copper, and PVC. (I know the advantages of PEX but prefer the time tested Copper) Obviously I am not a plumber but I enjoy a challenge and working with my hands. The main question I have is that the house currently has 3 vents in different sections of the house/system only 1 is currently in active use due to years of cutting and piecing by previous owners. My thought/intention was to replace the main sewer line (Cast) with PVC and run the perimeter of my basement with 5-6 inch main line hooking in the various fixtures and vents along the way. I created a logical (IT guy) mapping of my intention and was interested in the thoughts of the community.