Scaffolding provides temporary access and working platforms for construction, and is governed in Australia primarily by AS/NZS 1576 (scaffolding) and AS/NZS 4576 (guidelines for scaffolding).
Scaffold-related incidents (collapse, falls from height) remain among the most common serious construction injuries: design, erection competency, and inspection all matter.
Scaffold Types
| Type |
Description |
Typical Use |
| Tube and coupler |
Fully adjustable, jointed with couplers |
Complex/irregular structures |
| Modular (system) scaffold |
Pre-engineered frames and components |
Standard building facades |
| Mobile scaffold (castor-mounted) |
Wheeled, moveable working platform |
Short-duration, low-height tasks |
| Suspended scaffold |
Hung from an overhead structure |
Facade access on tall buildings |
| Cantilevered scaffold |
Projects outward from a structure |
Where ground-supported access is impossible |
Scaffold Classification by Duty
| Duty Rating |
Uniform Load |
Typical Use |
| Light duty |
1.5 kPa |
Access, inspection, painting |
| Medium duty |
2.25 kPa |
General trades, bricklaying |
| Heavy duty |
4.5 kPa |
Masonry, material storage on deck |
| Special duty |
Design-specific |
Heavy plant, concentrated loads |
Design Considerations
- Foundation: sole boards/base plates spreading load to acceptable ground bearing pressure
- Bracing: diagonal bracing for longitudinal and transverse stability
- Tie-in to structure: ties at specified vertical/horizontal spacing to resist wind and stability loads
- Wind loading: sheeted or shrink-wrapped scaffolds attract significantly higher wind loads: bracing and ties must be re-checked
- Working platform: full boarding, toe boards, and guardrails (top rail, mid rail)
Competency and Licensing (Australia)
| Licence Class |
Scope |
| Basic scaffolding |
Basic scaffold up to 4 m |
| Intermediate scaffolding |
Includes cantilevered, tube and coupler, and higher structures |
| Advanced scaffolding |
All scaffold types, including suspended and cantilevered systems of any height |
Scaffolding over a certain height/complexity legally requires a licensed scaffolder under Australian WHS Regulations, and often a scaffold design certified by a competent person or engineer.
Inspection Requirements
| Inspection Trigger |
Requirement |
| After erection, before use |
Handover inspection and tag (e.g. green "scaffold complete" tag) |
| Periodic (typically every 30 days) |
Re-inspection while scaffold remains in use |
| After any incident affecting scaffold |
Severe weather, impact, or alteration |
| Before reuse after alteration |
Re-inspection and re-tagging |
Scaffold tagging system:
| Tag Colour |
Meaning |
| Green |
Complete and safe to use |
| Yellow |
Incomplete: restricted use, additional PPE/precautions |
| Red |
Unsafe: do not use |
Common Failure Modes
- Inadequate bracing leading to progressive collapse
- Overloading beyond duty rating (especially material storage on deck)
- Missing or inadequate ties to the structure
- Foundation failure (soft ground, unbraced base plates)
- Unauthorised alteration by trades without re-certification
Practical Notes
- Sheeting or shrink-wrapping a scaffold dramatically increases wind load: this is one of the most common causes of scaffold collapse and must be reflected in the design, not assumed to be covered by standard bracing.
- Never allow scaffold alteration by unlicensed personnel: even removing a single brace can compromise overall stability.
- Duty rating must match actual site use, not intended use: material storage on a light-duty scaffold is a frequent and serious overload scenario.
Related Resources
