What plumbing term is used to describe the system installed before final fixtures?

The term "rough in" specifically refers to the initial stage of plumbing installation where the framework of pipes and connections is laid out prior to the installation of final fixtures such as sinks, toilets, or bathtubs. During this phase, the plumbing system is positioned but not yet complete, allowing for adjustments and inspections to ensure everything is set up correctly.

Rough-in plumbing typically includes the installation of water supply lines, drainage pipes, venting, and other essential components that are concealed behind walls or under floors. This stage is critical in preparing the plumbing infrastructure before moving on to the visible and functional aspects of plumbing, which are addressed during the finish plumbing stage. Understanding this distinction is crucial for anyone involved in plumbing design or installation, as it lays the groundwork for ensuring that the plumbing system functions effectively and adheres to code requirements.