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How far above the the drain line should the vent line be? First of all thanks a lot for everyone that replied. I appreciate your time and opinions. I can run a second line as the vent. I was just not sure why the "loop" part. But from the responses it sounds like I don't really need the loop...

Building a true loop vent isn't really an option for me. More work then I can do, my basement is fully finished. Do I have to have it? What if I connect directly into the stack that is 13 feet away? Why the 3 ft rule? Also can anyone explain what a loop went supposed to prevent/help...

I am doing my first project in my basement. I need to put in a sink, but I am about 15 feet away from the waste-vent stack. I was just going to run a pipe along the walls and tie into the existing one(where I have another sink connected to). I did some research and found out that if I am more...