Plumbing works on the simple concept of “water in — water out.” In a new home, the plumbing system features three main components, the water supply system, the drainage system and the appliance/fixture set. In most communities, in order to install plumbing, you must be a licensed plumber or you must work under a licensed plumber who approves and oversees your work. Local codes determine standard plumbing procedures, but a new home’s fixture placement, pipe routing diagram and pipe size depends on the home’s individual layout.
Sewer accommodation stubs are set before pouring the concrete foundation, but the bulk of the plumbing takes place later. The rough-in plumbing phase, which occurs in conjunction with the wiring and duct installation phase, takes place after the framing is complete, but before hanging drywall. This is the time to install main drains in floors and connect them to the stack. Rough-in drain fittings install now for sinks and tubs. This is also the time to install water supply pipes or tubing and set toilet flanges.