Okay, first off, anyone use this message board that knows any of the Kentucky Code??
My question is, the code states that a building drain that serves a house shall be attached to a building sewer, with a minimum of one 3″ vent stack through the roof connected to a 3″ main waste line. Okay, I know the building sewer starts 2′ from the outside wall of the building and it’s 4″ minimum (according to how many fixture units that are on it).
Does this building drain have to be 4″ inside the wall before going outside 2′ to make it 4″? OR, do you just increase from a 3″ to a 4″, 2′ outside the building wall where you put your cleanout at?
Thanks!!