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Before the walls close · California homes

Plumbing Rough-In

See how the plumbing takes shape before finishes go in. Ten illustrated stages bring water, drains, vents, and fixture connections together throughout a luxury home.

10Illustrated stages
01–02   Layout & supplies03–05   Bathrooms06–07   Kitchen & laundry08–10   Protection & review

The installation, step by step

Select any photo to view it larger.

Planning & supply routing

Fixture Layout & Finish Coordination

The rough-in starts with the selected fixtures, cabinet layouts, and intended finished wall and floor surfaces. Supply outlets, drains, valve depths, and access points are coordinated before piping is installed.

Key consideration · Use the actual fixture dimensions and installation instructions; rough-in positions are specific to the project.
Planning & supply routing

Hot & Cold Supply Rough-In

Separate hot and cold branches are routed through the open framing and secured to blocking. Capped outlets protect the piping during construction. This view shows the installation before required hot-water insulation is added.

Key consideration · Coordinate sizing, compatible supports, protected penetrations, and testing before the piping is concealed.
Bathroom rough-in

Double-Vanity Supply, Drain & Vent

Each basin location receives its own hot and cold outlets and a capped drain connection. The drain inlets connect to upright drain-and-vent fittings, with the vents continuing upward through the wall framing.

Key consideration · Align outlets with the vanity and sink layout while preserving the trap-arm connection and vent route.
Bathroom rough-in

Shower Valve & Riser Installation

The shower valve body is fixed to solid blocking at the depth required for the future wall finish. Separate hot and cold supplies connect to the valve, and the shower riser ends at a securely mounted outlet.

Key consideration · Use the required protective shower control valve and follow its listing for ports, unused-outlet closure, and finish depth.
Bathroom rough-in

Freestanding-Tub Rough-In

The tub-filler base and separate drain opening are positioned for the selected freestanding tub. The supply assembly is anchored and protected while the drain remains capped until the fixture is installed.

Key consideration · Coordinate the mounting depth, drain location, waterproofing, and finished floor with the selected tub and filler.
Kitchen & laundry rough-in

Kitchen Sink Connections

The future sink cabinet receives distinct water-supply outlets and a capped drain inlet. The drain continues downward while the vent rises through the service wall, leaving the fixture connections ready for later finish work.

Key consideration · Reserve space for the sink, cabinet drawers, trap, and appliance connections without obstructing the vent route.
Kitchen & laundry rough-in

Laundry Supply Box, Standpipe & Vent

An anchored supply box provides separate washer connections. Beside it, the standpipe leads to an above-floor P-trap and a short trap arm, with the vent rising from the upright drainage connection.

Key consideration · Coordinate the standpipe, trap, box position, and appliance clearances before the laundry wall is closed.
Protection & pre-cover coordination

Framing Protection & Pipe Supports

Protective plates shield piping where fasteners could reach it through the framing. Sleeves or bushings protect appropriate penetrations, and compatible supports hold the line without crushing or damaging it.

Key consideration · Protect both the piping and the structure; use the approved details for holes, notches, plates, and supports.
Protection & pre-cover coordination

Hot-Water Insulation After Rough Testing

After the required rough testing and inspection steps, hot-water piping receives the specified insulation. This work-in-progress view shows a short connection still being covered; coverage and seams are completed before closure.

Key consideration · Apply the California insulation requirements and permitted exceptions, coordinating the work with the local inspection sequence.
Protection & pre-cover coordination

Final Review Before Wall Closure

A final coordination review checks fixture positions, pipe protection, access, and remaining insulation details. Supply and DWV tests are separate operations completed at the required earlier stages; walls stay open until the required acceptance is obtained.

Key consideration · This illustrates coordination in progress, not an official inspection pass. Complete outstanding protection and insulation before covering.

Planned for California projects

These AI-generated images illustrate typical rough-in work for one- and two-story residences; they are not photographs of completed Omega projects or a construction specification. The 2025 California Plumbing Code, applicable energy requirements, approved plans, product instructions, and local amendments govern the actual work.

California code & project considerations
  • Coordinate every fixture rough-in with its listing, mounting requirements, and intended finished wall or floor.
  • Use the required pressure-balancing, thermostatic, or combination shower control valve. The 2025 CPC addresses shower control valves in §408.4.
  • Keep potable supplies separate from drainage, provide proper fixture vent connections, and protect piping and framing at penetrations.
  • Photos with bare hot-water copper show unfinished installation stages. Required insulation coverage is completed before concealment, subject to applicable exceptions.
  • Coordinate water-supply testing and DWV water testing separately. Do not test plastic DWV with compressed air.
  • Arrange required rough inspections while work remains exposed; insulation and pre-cover reviews follow the local inspection sequence.

Sources: 2025 California Plumbing Code · Sacramento 2025-code guidance · Milpitas fixture & inspection guidance · 2025 California Energy Code

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Omega Plumbing Inc. · Plumbing installation

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