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Work sequence

Engineering rough-in work sequence

Rough-in engineering fixes the routes that later disappear behind floors, walls and ceilings. The main risk is not only missing pipes or cables, but conflicts, poor access and untested hidden work.

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Connected product pages

This sequence is connected to the stage calculator, checklist and mistake-cost pages so planning, execution and cost risk stay in one system.

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Recommended sequence of work

01

Coordinate routes and service zones

Prevent MEP clashes before cutting, chasing or closing structure.

  • Overlay plumbing, drainage, electrical, low-voltage, ventilation and AC routes.
  • Reserve shafts, ceiling voids, service access and equipment clearances.
  • Confirm condensate drainage, fresh-air routes and exhaust discharge points.

Hold point: Rough-in installation should not start until service routes and access zones are coordinated.

Tools, equipment and access: Coordination drawings, Laser level, Chalk line, Access zone markup

02

Install conduits, pipes, ducts and sleeves

Place hidden services in the right position with future maintenance in mind.

  • Install pipework, conduit, cable trays, drains, sleeves and supports.
  • Maintain slopes for drainage and condensate lines.
  • Protect penetrations, fire/smoke barriers and waterproofing interfaces.

Hold point: Wall or ceiling closure should wait until supports, slopes and penetration details are checked.

Tools, equipment and access: Pipe cutter, Conduit bender, Core drill, Duct tools, Support fixings

03

Test and record hidden work

Make hidden engineering auditable before finishes create expensive access problems.

  • Pressure-test water systems and leak-check drainage where possible.
  • Continuity-test cable runs and label both ends.
  • Photograph routes with dimensions before closing walls, floors or ceilings.

Hold point: Do not close assemblies until tests, labels and photo records are complete.

Tools, equipment and access: Pressure test pump, Multimeter, Cable toner, Label printer, Photo log

Tools, equipment and access

Routing and supports

  • Laser level
  • Core drill
  • Conduit bender
  • Pipe cutter
  • Duct snips

Testing

  • Pressure test pump
  • Multimeter
  • Cable toner
  • Manometer
  • Smoke pencil

Records

  • Label printer
  • Photo log
  • Route drawings
  • Access hatch schedule

Planning material consumption norms

Consumption ranges are planning benchmarks. Final quantities must be checked against drawings, specifications, local codes and supplier data sheets.

Material or resource Basis Planning range Unit Planning note
Electrical conduit Gross floor area 1.5-3.5 lm/m2 Higher for smart-home, lighting scenes and dense outlets.
Water and drainage pipe Wet room 6-14 lm/room Fixture count gives better accuracy.
AC refrigerant and condensate routes Indoor AC unit 3-12 lm/unit Depends on outdoor unit distance and drainage route.
Ductwork surface area Served floor area 0.20-0.60 m2/m2 Use for ducted AC or fresh-air systems.

Quality gates before moving forward

Related glossary terms