The initial stage of installing a plumbing system within a structure is a critical process. This phase involves installing all the drain, waste, vent, and water supply lines within the walls, floors, and ceilings, prior to any finishing work like drywall or flooring installation. An example is running copper pipes for water supply and PVC pipes for drainage, connecting them to future fixture locations, but leaving the actual fixture installation (faucets, toilets, etc.) for later.
This pre-installation work is important because it allows for comprehensive inspection of the system before concealment, ensuring all connections are secure and meet code requirements. It avoids costly rework later on. Historically, these systems were simpler, but modern building codes and fixture designs require more complex and precise installations. Proper planning and execution during this preliminary stage translate to a more efficient and reliable plumbing system in the long run.