How to Safely Set Up a Ladder for Roof Painting

Roof painting is one of the most common DIY jobs that sends Kiwis to the emergency department each year. Getting your ladder set up correctly before you climb a single rung is the single most important thing you can do to stay safe. Here's what every NZ homeowner needs to know before picking up a brush.

Understanding the Risks of Working at Height

In New Zealand, falls from height are a leading cause of serious injury and death in and around the home. WorkSafe NZ classifies work on roofs and ladders as working at height, and even a fall from a single-storey roof can be fatal. Before you start, honestly assess whether this is a job you're comfortable doing safely — or whether it's better left to a professional roof painter.

Choosing the Right Ladder

Not every ladder is suitable for roof painting. Consider the following:

• Extension ladders are generally best for reaching a roof edge. Choose one rated for your weight plus your tools and paint.
• Ladder duty rating: In NZ, ladders are rated by load capacity. Make sure yours is rated for at least 120 kg if you're a heavier person or carrying equipment.
• Length: Your ladder should extend at least 900 mm above the roof edge or gutter line so you have something to hold onto as you step on and off.
• Avoid using old, damaged, or makeshift ladders. Check rungs, feet, and locking mechanisms before every use.

The Correct Ladder Angle (The 4-to-1 Rule)

The most important setup principle is the 4-to-1 rule:

For every 4 metres of vertical height, the base of the ladder should be 1 metre out from the wall.

For example, if your eaves are 4 m high, the ladder feet should sit 1 m out from the house. This gives roughly a 75-degree angle — steep enough to be stable, not so steep that it tips backward. A ladder that's too upright or too flat is dangerous.

Setting Up the Ladder Base Safely

Choose a Firm, Level Surface

• Place the ladder on firm, flat ground. Avoid soft soil, gravel, or wet grass where feet can sink or slip.
• If the ground is uneven, use a ladder leveller (available at Bunnings or Mitre 10) rather than propping the feet on bricks or timber offcuts.
• Never set up a ladder on a deck or raised surface unless it is specifically secured.

Secure the Feet

• Most extension ladders have rubber non-slip feet — check these are in good condition before use.
• On hard surfaces like concrete, consider using a ladder mat or having a second person foot the ladder (hold the base firmly with their foot and hands).
• On soft ground, use a ladder board (a wide plank) under the feet to spread the load and prevent sinking.

Secure the Top of the Ladder

• Where possible, tie the top of the ladder to a fixed point — a roof anchor, a sturdy fascia bracket, or a ladder standoff (also called a ladder stay or ladder stand-off).
• A ladder standoff holds the ladder away from the guttering, protecting both the gutter and giving you a more stable, comfortable working position.
• Never rest a ladder directly against plastic guttering — it can crack and give way suddenly.

Using a Roof Ladder (Roof Hook)

If you need to work on the roof surface itself rather than just painting from the ladder at the eaves, a standard extension ladder is not enough. You'll need a roof ladder (sometimes called a cat ladder or roof hook ladder):

• A roof ladder hooks over the ridge and lies flat on the roof surface, giving you a safe working platform.
• These can be hired from most tool hire shops or purchased at Mitre 10 or Bunnings.
• Always use a roof ladder in combination with your extension ladder — never try to walk directly on a painted or wet roof surface.

Safe Working Practices on the Ladder

• Three points of contact at all times: two feet and one hand, or two hands and one foot.
• Never overreach — if you can't reach comfortably, move the ladder.
• Keep your belt buckle between the rails at all times (don't lean out past the sides).
• Wear non-slip footwear — rubber-soled boots are ideal.
• Never carry a full paint bucket up a ladder. Use a paint pot hook or a small bucket with a handle that clips to a rung.
• Work with a buddy where possible — someone on the ground can foot the ladder, pass materials, and call for help if needed.
• Avoid working in wet, windy, or icy conditions. NZ weather can change quickly, especially in spring and autumn.

Roof Anchor Points and Fall Arrest

For steeper roofs or two-storey homes, consider installing a temporary roof anchor and using a fall arrest harness. This is standard practice for professional roof painters. Roof anchors must be installed correctly — if in doubt, have a professional assess your roof first. WorkSafe NZ has detailed guidance on fall protection for work at height.

When to Call a Professional

Some situations are best left to a qualified roof painter or tradesperson:

• Two-storey or higher homes — the risk increases significantly with height.
• Steep-pitched roofs (over 25 degrees) — very difficult and dangerous without professional equipment.
• Fragile roofing materials such as old corrugated iron, brittle tiles, or skylights.
• If you have any health conditions affecting balance, strength, or coordination.
• If you don't have the right equipment and aren't confident in your setup.

A qualified roof painter will have the correct safety gear, roof anchors, and experience to do the job efficiently and safely. You can find trusted local roof painters on tradedirectory.co.nz.

Sources & Further Reading

• WorkSafe NZ – Working at Height
• BRANZ – Safe Work on Roofs
• Bunnings – Ladders & Access Equipment
• Mitre 10 – Ladders & Scaffolding
• MBIE Building Performance – Building Code