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.
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
- MEP routes are coordinated with structure, ceiling levels and access hatches.
- Drainage and condensate slopes are visible and checked.
- Water systems are pressure-tested before closure.
- Hidden work photo archive includes routes, dimensions and labels.
Related glossary terms
Early installation of water supply and drainage lines.
Conduits, cable routes, and panel prep before finishes.
Fan-assisted supply or extract air system used when natural airflow is not enough.
Drainage path that removes water formed during cooling operation.
Cooling system distributing conditioned air through ducts, plenums, and air terminals.