Giantsfan301
Member
I am finishing my attic and I need some help making sure I install the drainage and venting for the bathroom correctly. In the picture I plan on putting the bathroom as close as I can to the water heater and the ducts you see. Picture a rectangle pushed up against the water heater and the air duct. It will contain a sink a shower and a toilet. I have a 3 inch waste line that is off the left(you can barely see it. It has some pink insulation near it in one picture) which runs through an exterior wall and comes out just above my master bathroom makes two 45 degree turns and then immediately goes out my roof. I also have the 2 inch vent for the sink in that bathroom coming up in that area but it is just on the other side of that duct. My first question is how can I tie into that 3 inch drain pipe. I need the point where I tie into with my drain to be as low as possible to get my slope. Now, as far as venting should I just put a dry vent from the new plumbing straight out my roof as soon as I get past the drywall from the new bathroom. I am getting a new roof so this would be very simple. I hope the pictures help. Thanks