Yes, you can absolutely use a brush to paint ridge capping — and in many situations, a brush is actually the preferred tool. Ridge capping has a complex profile with angles, edges, and overlapping joints that are tricky to coat evenly with a roller alone. A good-quality brush gives you control, penetration into crevices, and a thorough finish that helps protect against the harsh New Zealand weather.
Why Ridge Capping Is Tricky to Paint
Ridge capping sits at the very peak of your roof, exposed to full sun, wind, rain, and temperature swings year-round. Whether your capping is concrete, terracotta, fibre cement, or metal, it needs a well-applied, even coat of paint to resist UV degradation, moisture ingress, and moss or lichen growth — all common issues in NZ's varied climate.
The profile of ridge capping — with its curved or angled surfaces, mortar joints, and tight corners — means a roller can miss spots, leave thin coverage on edges, and fail to work paint into hairline cracks or porous surfaces. These missed areas become entry points for water, which can lead to costly damage over time.
Brush vs Roller: Which Should You Use?
| Tool | Best For | Limitations |
|---|---|---|
| Brush | Edges, joints, mortar lines, detailed profiles, cut-in work | Slower on large flat areas |
| Roller | Flat or gently curved surfaces, faster coverage | Can miss crevices and edges |
| Both (recommended) | Full ridge capping job — brush first, roller to finish | Requires more tools |
For most ridge capping jobs, the best approach is to use a brush as your primary tool, working paint thoroughly into all the joints, edges, and profile changes. If your capping has broader flat sections, a small foam or short-nap roller (around 100–150 mm wide) can help speed up coverage on those areas after you've cut in with the brush.
Choosing the Right Brush
Not all brushes are equal. For ridge capping, look for:
- A 50–75 mm quality synthetic or blended bristle brush — wide enough to cover surface area but manageable on a roof
- Angled sash brushes for getting into mortar joints and tight corners
- A brush rated for the type of paint you're using (water-based or solvent-based)
Avoid cheap brushes — they shed bristles and leave an uneven finish. Quality brushes from Mitre 10 or Bunnings will make the job easier and give a better result.
Surface Preparation Comes First
No matter what tool you use, preparation is the most important step. Poorly prepped ridge capping will cause paint to peel or flake within a season.
- Clean thoroughly — remove all moss, lichen, dirt, and loose paint. A stiff brush, low-pressure wash, or appropriate biocidal wash works well. Allow to dry completely.
- Check mortar joints — repoint any cracked or crumbling mortar before painting. This is critical for weathertightness.
- Apply a suitable primer or sealer — porous concrete or terracotta capping especially benefits from a penetrating primer. Check the paint manufacturer's recommendations.
- Sand or scrape any flaking paint back to a firm edge.
BRANZ provides good guidance on roof maintenance and weathertightness best practice for NZ conditions.
Choosing the Right Paint
Use a roof-specific paint rated for exterior use in NZ conditions. Leading NZ paint brands offer dedicated roof paint systems:
- Resene offers roof paint products suitable for concrete and terracotta tiles
- Dulux has exterior roof coating systems
- Wattyl also carries roof and tile paint ranges
Always follow the manufacturer's data sheet for application method, coverage rates, and recoat times. Most roof paints recommend two coats for full protection.
Working Safely on a Roof
Painting ridge capping means working at height — this is where many DIY roof jobs go wrong. Safety must come first.
- Never work on a wet or damp roof — surfaces become extremely slippery
- Use appropriate roof ladders or crawl boards to spread your weight and avoid damaging tiles
- Wear non-slip footwear
- Use a properly secured ladder with a standoff bracket
- Consider a safety harness for steeper pitches
- Never work alone
Review WorkSafe NZ guidelines on working at height before starting any roof work.
When to Call a Professional
While painting ridge capping is not restricted work under the NZ Building Code (unlike electrical or plumbing), there are good reasons to hire a qualified roof painter:
- Steep or high roofs — the fall risk increases significantly with pitch and height
- Damaged or cracked capping — if mortar is failing badly or capping is lifting, this may indicate a weathertightness issue that needs professional assessment
- Large or complex roofs — a professional will have the right equipment, scaffolding, and experience to do the job efficiently and safely
- If you're unsure about the roof's condition — a professional can identify issues you might miss
You can find qualified, local roof painters on tradedirectory.co.nz to get the job done safely and to a high standard.
Master Painters NZ member
Licensed Building Practitioner (LBP)
Roofing Association of NZ (RANZ)
