What does the term 'rough in' refer to in plumbing?

The term 'rough in' in plumbing specifically refers to the phase of the plumbing installation where the basic piping and plumbing components are installed but before the final fixtures, such as sinks, toilets, and faucets, are connected. This stage involves laying out the water supply lines, drain lines, and any vent pipes necessary for the plumbing system to function properly. It establishes the infrastructure that will support the final connections and ensures everything is in place for when the fixtures are installed.

This phase is crucial because it determines the overall routing and positioning of the plumbing system within the walls or floors, as well as ensuring compliance with local codes and regulations. Once the rough-in is complete, a visual inspection typically occurs before the walls are closed up. After inspection, the finish work can commence, which involves the installation of fixtures and connections, completing the plumbing project.