Scaffolding Erection & Dismantling
Scaffold erection, inspection, modification, and dismantling lifecycle
ConstructionLead Time
299.25h
Cycle Time
16.75h
Wait Time
282.5h
PCE
4.7%
Stages
10
Bottleneck
In-Use Inspections (weekly)
Value-Add vs Non-Value-Add
Value-Add (VA)
An activity is value-add if it meets all three criteria:
- The customer is willing to pay for it
- It transforms the product or service
- It is done right the first time
Examples: Assembly, diagnosis, treatment, coding, machining, testing
Non-Value-Add (NVA)
Activities that consume time or resources but don't add value from the customer's perspective:
- Waiting — queues, approvals, batching delays
- Transport — moving materials or information
- Motion — unnecessary movement of people
- Rework — correcting defects or errors
- Over-processing — doing more than required
Note: Some NVA is necessary (compliance, safety). Target unnecessary NVA first.
Process Timeline
Value-Add vs Non-Value-Add
Bottleneck Analysis
Stage Efficiency
| # | Stage | Cycle (h) | Wait (h) | VA | Resource | Defect % | Efficiency |
|---|---|---|---|---|---|---|---|
| 1 | Scaffold Request & Assessment | 1.0 | 24.0 | VA | Scaffold Supervisor | 5.0% | 4.0% |
| 2 | Material Delivery & Staging | 1.5 | 8.0 | NVA | Truck Driver | 3.0% | 15.8% |
| 3 | Erection — Base & Standards | 4.0 | 0.5 | VA | Scaffold Crew | 4.0% | 88.9% |
| 4 | Erection — Platforms & Handrails | 3.0 | 0.0 | VA | Scaffold Crew | 6.0% | 100.0% |
| 5 | Tag & Inspection | 0.5 | 4.0 | VA | Competent Person | 15.0% | 11.1% |
| 6 | Handover to Trade | 0.25 | 2.0 | NVA | Site Supervisor | 2.0% | 11.1% |
| 7 | In-Use Inspections (weekly) | 0.5 | 168.0 | VA | Competent Person | 8.0% | 0.3% |
| 8 | Modification Requests | 2.0 | 24.0 | VA | Scaffold Crew | 10.0% | 7.7% |
| 9 | Dismantling | 3.0 | 48.0 | VA | Scaffold Crew | 5.0% | 5.9% |
| 10 | Material Return & Check | 1.0 | 4.0 | NVA | Storeman | 3.0% | 20.0% |