Technically, a pulley system can be attached to scaffold tubes, but doing so safely is far more complex than it looks. In New Zealand, scaffolding is governed by strict health and safety rules, and adding a lifting rig to an existing scaffold structure introduces load and stability risks that can — and do — cause serious injuries and fatalities. Before you reach for a rope and a snatch block, read this carefully.
Why Scaffold Tubes Aren't Simply a Ready-Made Crane
Scaffold tubes are designed to carry vertical compressive loads — the weight of workers and materials distributed across the structure. When you attach a pulley and start hoisting heavy roofing iron, you introduce lateral (sideways) and point loads that the scaffold may not be designed or braced to handle.
Roofing iron sheets are also awkward and wind-affected. A gust can turn a sheet into a sail, suddenly jerking the scaffold sideways. If the structure isn't engineered for that, the whole thing can shift or collapse.
What NZ Law Says About Scaffolding and Lifting
Under the Health and Safety at Work Act 2015, anyone who designs, erects, or modifies a scaffold has a duty to ensure it is safe for its intended use. If you modify a scaffold to include a lifting system, you are effectively changing its design — and taking on legal responsibility for that change.
WorkSafe NZ publishes guidance on scaffolding and working at height. Key points for homeowners:
- Scaffolding over 5 metres in height must be erected, altered, or dismantled by a licensed scaffolder (a person with a relevant certificate of competence under the Health and Safety at Work (General Risk and Workplace Management) Regulations 2016).
- Adding a pulley or lifting attachment to an existing scaffold is considered an alteration to that scaffold.
- Even on lower scaffolds, any modification that changes the load path should be assessed by a competent person.
In short: if your scaffold is over 5 metres, you legally cannot modify it yourself. Even under 5 metres, doing so without understanding the engineering is dangerous.
Risks Specific to Lifting Roofing Iron
Roofing iron (corrugated steel or long-run steel) presents particular hazards when lifted by pulley:
- Sharp edges can cut ropes, slings, or hands instantly.
- Wind loading is unpredictable — sheets act like sails.
- Unbalanced loads can tip and swing, striking the scaffold or people below.
- Point loading on a single tube can buckle or dislodge it from its fittings.
- Dropped sheets from height are potentially fatal to anyone below.
A proper exclusion zone must be established beneath any lifting operation, and bystanders (including neighbours) must be kept clear.
What a Licensed Scaffolder Would Do Differently
A qualified scaffolder assessing this job would consider:
- Whether the scaffold's base plates, standards, ledgers, and bracing can handle the additional point load from a pulley anchor.
- Whether a gin wheel (a simple pulley designed for scaffold use) is appropriate, or whether a materials hoist is needed instead.
- The Safe Working Load (SWL) of every component — tubes, couplers, ropes, and the pulley itself.
- Correct lashing or coupler attachment of the pulley block so it cannot slip or rotate under load.
- Whether a spotter and exclusion zone are in place.
Gin wheels are a recognised scaffold accessory in NZ trade practice, but they must be rated for the load, correctly attached with a swivel coupler or purpose-made fitting, and used only on a scaffold that has been assessed as suitable.
What Homeowners Can and Cannot Do
| Task | Homeowner allowed? |
|---|---|
| Erect basic scaffold under 5 m for own home | Generally yes, with care |
| Modify or add to scaffold over 5 m | No — licensed scaffolder required |
| Attach a pulley to scaffold tubes | Only if scaffold is under 5 m, load is light, and you understand the risks |
| Operate a materials hoist | Requires training and correct equipment |
| Work on the roof itself | Yes, but fall protection is still required |
Always check with your local council whether your project requires a building consent — roofing work on an existing dwelling may qualify as exempt work under Schedule 1 of the Building Act 2004, but confirm this before starting. See MBIE Building Performance for guidance.
Safer Alternatives for Getting Roofing Iron Up High
- Hire a materials hoist — purpose-built for lifting sheet materials, available from hire companies around NZ.
- Use a roofing ladder with a sheet carrier for smaller jobs.
- Ask your roofing contractor — most experienced roofers have their own methods and equipment for getting iron to the roof safely.
- Hire a scaffolding company that can include a properly rated gin wheel as part of the scaffold package.
When to Call a Professional
If your scaffold is over 5 metres, call a licensed scaffolder — this is a legal requirement, not just a recommendation. Even on lower scaffolds, if you're unsure about load capacity, attachment methods, or working safely at height, get a professional involved. A qualified scaffolder can rig a gin wheel correctly, confirm the structure is adequate, and set up a safe exclusion zone.
You can find licensed scaffolders and roofing contractors in your area at tradedirectory.co.nz.
