On Day 20, the plumbing rough-in phase is completed, during which pipes for water supply, drainage, and waste systems are installed within walls, floors, and ceilings before finishes are applied. Plumbers lay out copper, PEX, or PVC piping according to architectural plans, connecting to main lines and preparing for future fixtures like sinks, toilets, and showers. Vents are installed to allow air into the drainage system, ensuring proper flow and odor control. All connections are pressure-tested to confirm there are no leaks. Pipes are carefully positioned to avoid interference with electrical wiring and HVAC ducts. This stage focuses on the infrastructure, not the final fixtures, which are added later. Once completed, inspections by local authorities verify compliance with plumbing codes for safety and sanitation. A successful rough-in ensures smooth functionality of all water-related systems, preventing future issues and enabling efficient installation of bathroom and kitchen finishes. It’s a foundational step in creating a comfortable and hygienic living environment.