Working on scaffolding in light rain is one of the more common hazards on NZ job sites, given our changeable weather. The short answer: light rain is manageable with the right precautions, but you must assess conditions carefully every time — and when in doubt, stop work. Your safety is never worth the risk of a fall from height.
Understanding the Risks of Wet Scaffolding
Even a light drizzle can make scaffold planks, metal tubes, and access ladders significantly more slippery. The main hazards include:
- Slippery walking surfaces — particularly on timber planks, aluminium decking, or painted surfaces
- Reduced grip on handrails and tubes
- Wet footwear losing traction quickly
- Reduced visibility affecting your awareness of edges and gaps
- Tool and material handling becoming harder and more unpredictable
Falls from height are one of the leading causes of serious injury and death in the NZ construction industry. WorkSafe NZ sets out clear duties for both employers and workers to manage these risks under the Health and Safety at Work Act 2015.
Your Legal Duties Before You Step On
Under NZ law, every person on a work site has a duty to take reasonable care for their own safety and the safety of others. Before working on scaffolding in wet conditions, a documented risk assessment should be carried out. Ask yourself:
- Is the rain light and intermittent, or steady and persistent?
- Are the scaffold planks draining freely, or pooling water?
- Is the scaffold compliant and recently inspected?
- Are all handrails, mid-rails, and toe boards in place?
- Do I have appropriate PPE for wet conditions?
If you are an employer or self-employed tradesperson, WorkSafe NZ requires you to have a Safe Work Method Statement (SWMS) for high-risk construction work, which includes work on scaffolding. Check with WorkSafe NZ for the current height threshold and specific requirements that apply to your work.
Practical Safety Precautions for Light Rain
Footwear
Always wear steel-capped boots with slip-resistant soles rated for wet surfaces. Smooth-soled gumboots or worn-out work boots are not appropriate on scaffolding. Check your soles before climbing — mud or debris on the sole dramatically reduces grip.
Non-Slip Surfaces
Check that scaffold planks have non-slip strips or mesh decking in good condition. Timber planks can become very slick when wet, especially if they have any algae or grime build-up. If your planks lack grip, consider applying non-slip tape or temporarily halting work until conditions improve.
Personal Protective Equipment (PPE)
- Wear a fall arrest harness connected to a suitable anchor point whenever guardrails alone are not sufficient
- Use waterproof, close-fitting gloves that maintain grip — bulky gloves can reduce dexterity and increase risk
- A hi-vis rain jacket keeps you visible and dry without restricting movement
Three Points of Contact
Always maintain three points of contact when climbing or descending scaffold ladders — two hands and one foot, or two feet and one hand. Never carry tools or materials in your hands while climbing; use a tool belt or hoist.
Reduce Clutter on the Platform
Wet conditions make tripping hazards worse. Keep scaffold platforms clear of tools, off-cuts, and materials not immediately in use. Ensure toe boards are in place to prevent items falling to the ground below.
Communicate with Your Team
Let everyone on site know conditions are wet. Establish a clear process for calling a stop to work if conditions deteriorate. No deadline is worth a serious injury.
When to Stop Work Entirely
There are conditions where you should not work on scaffolding, regardless of time pressure:
- Heavy or persistent rain — surfaces become saturated and grip is lost
- Wind gusts above 40 km/h — rain combined with wind significantly increases the risk of losing balance
- Thunderstorms — metal scaffolding is a lightning conductor; evacuate immediately
- Icy or frosty conditions — common in southern NZ and at altitude; ice on planks is extremely dangerous
- Visible pooling water on platforms with no drainage
- Any doubt about scaffold integrity — if the structure has not been inspected after a storm or high winds, do not use it
WorkSafe NZ provides guidance on safe scaffold use in NZ conditions.
Scaffold Inspection After Rain
After significant rainfall, a competent person should inspect the scaffold before work resumes. Check for:
- Shifted or settled base plates and sole boards
- Loosened couplers or connections
- Waterlogged or warped timber planks
- Debris accumulation on platforms
- Any changes to the surrounding ground that could affect scaffold stability
Under NZ practice, scaffolding over 5 metres generally requires erection, alteration, and dismantling by a competent scaffolder. Always confirm requirements with WorkSafe NZ and your local council.
When to Call a Professional
If you are a homeowner considering DIY work on hired scaffolding, be aware that working at height in wet conditions carries serious risk. A qualified, experienced scaffolder understands how to assess and manage these hazards. For any scaffold over 5 metres, or any work where you feel uncertain about safety, hire a licensed scaffolding professional. You can find qualified local scaffolders on tradedirectory.co.nz.
If your scaffold was erected by a contractor and you have concerns about its condition in wet weather, contact them before proceeding — they have a duty to ensure the structure is safe.
