Choosing a roof painter is one thing — but knowing whether they're using quality paint products is another challenge entirely. The good news is there are several straightforward ways to check, and a reputable tradesperson will always be happy to discuss the products they use and why.
Why the Paint Product Matters So Much
Your roof is exposed to some of the harshest conditions in New Zealand — intense UV radiation, driving rain, salt air in coastal areas, and temperature swings that cause roofing materials to expand and contract. A quality roof paint needs to handle all of this while still protecting the substrate underneath. Using a cheap or inappropriate product can lead to peeling, cracking, and premature failure — sometimes within just a few years — leaving you with a costly re-paint job far sooner than expected.
Ask for the Product Name and Data Sheet
The simplest and most effective thing you can do is ask your roof painter to name the specific product they plan to use. A confident, experienced tradesperson will tell you straight away. Once you have the product name, you can:
- Look it up on the manufacturer's website to confirm it's a genuine roof coating
- Download the Technical Data Sheet (TDS) and check that it's rated for your roof type (e.g. concrete tile, metal, Colorsteel, fibrous cement)
- Check the recommended dry film thickness and coverage rates — quality products will specify these clearly
- Confirm the expected lifespan stated by the manufacturer
Well-known and trusted NZ roof paint brands include Resene, Dulux, and Wattyl. All three have dedicated roof coating ranges with full technical documentation available online.
Check That the Product Suits Your Roof Material
Not all roof paints are interchangeable. Using the wrong product for your substrate is a common cause of early paint failure. Here's a general guide:
| Roof Type | What to Look For |
|---|---|
| Concrete or clay tiles | Penetrating primer + elastomeric topcoat |
| Corrugated iron / steel | Rust-inhibiting primer, metal-rated topcoat |
| Colorsteel or Zincalume | Specific metal primers — check manufacturer specs |
| Fibrous cement tiles | Alkali-resistant primer, breathable topcoat |
| Butynol or membrane | Specialist coatings only — check with manufacturer |
Always confirm with your painter that the primer and topcoat are compatible with each other and with your specific roof material.
Look for Reputable Brands and Avoid Unknown Products
Be cautious if a painter can only tell you they're using "a good quality paint" without naming the brand or product. Some less scrupulous operators use cheap, unbranded, or imported products that aren't suited to NZ conditions. Stick to painters who use products from established NZ suppliers. You can browse roof coating ranges at Resene, Dulux, and Wattyl to familiarise yourself with what's available before you get quotes.
Ask About the Number of Coats
Quality roof painting isn't just about the product — it's also about application. A proper job typically involves:
- A thorough clean (moss and lichen treatment, water blasting)
- A suitable primer or sealer coat
- At least two topcoats applied at the correct coverage rate
If a quote seems unusually cheap, it may be because the painter is cutting back on coats or using a heavily diluted product. Ask specifically how many coats are included and what the coverage rate per litre will be.
Request a Written Specification
For any significant roof painting job, ask for a written paint specification as part of your quote. This should include:
- The brand and product name for each coat (primer, sealer, topcoat)
- The number of coats
- The colour code
- The expected coverage rate
- Any surface preparation steps
Having this in writing protects you if the finished job doesn't match what was agreed, and gives you something to refer back to if warranty issues arise later.
Check Manufacturer Warranties
Many quality roof paint products come with a manufacturer's warranty — but only when applied by a qualified painter following the product's technical guidelines. Ask your painter whether the product they're using carries a warranty, and whether they'll be applying it in a way that keeps that warranty valid. BRANZ is a useful independent resource for understanding paint and coating performance in NZ conditions.
When to Call a Professional
Roof painting is physically demanding and potentially dangerous work — working at height carries serious risks. WorkSafe NZ has clear guidelines around working safely at height, and a professional roof painter will have appropriate safety equipment and procedures in place. While roof painting itself isn't legally restricted work in the same way as electrical or plumbing, it's strongly recommended you hire an experienced, insured tradesperson rather than attempting it yourself. A qualified roof painter will also know how to identify underlying issues — cracked tiles, rust, or damaged flashings — that need attention before painting begins.
You can find qualified local roof painters on tradedirectory.co.nz and compare quotes from tradespeople who can provide full product specifications upfront.
Sources & Further Reading
- Resene Roof Coatings — product ranges and technical data sheets
- Dulux NZ — roof paint systems and application guides
- Wattyl NZ — roof coating products for NZ conditions
- BRANZ — independent building research and paint performance guidance
- WorkSafe NZ — working at height safety requirements
- MBIE Building Performance — NZ Building Code and maintenance obligations
Master Painters NZ member
Licensed Building Practitioner (LBP)
Roofing Association of NZ (RANZ)
