Why painting a roof is different in Nelson
More sun, faster wear
Nelson City averages about 2,400 sunshine hours a year, among the highest in New Zealand, and NIWA says UV here is higher than in the far south. Constant sun breaks down paint film and fades the colour, so a Nelson roof can look tired before the paint has actually failed. Chalky residue on your hand is the tell.
A dry window, but watch the spring wind
Rain is spread fairly evenly, from 64 mm in February to 92 mm in June, over 95 wet days a year. Spring has the most strong-wind days, about 11, against 6 in autumn, and wind is what spoils spray work. Late summer into autumn usually gives the calmest, driest run.
Frost and dew in winter
July averages 21 ground frosts and 11 air frosts. Paint needs a dry surface, so winter jobs lose their mornings to frost and dew. It can be done, but expect delays.
Salt near the water
Within 500 m of Tasman Bay or Nelson Haven, homes are in exposure Zone D. The metal roofing Code of Practice says areas rain doesn't wash, like overhangs and unlined soffits, collect salt and corrode faster. On a coastal iron roof, treat rust at the eaves early, before it creeps under the new paint.
Heritage streets
The South Street area is designated as having heritage value, and the centre keeps many Victorian buildings. If you live in a heritage area, check with Nelson City Council whether colour or material limits apply before you settle on a new colour.
Older roofs need a gentler wash
WorkSafe says homes built before 2000 may contain asbestos. For weathered asbestos cement or decramastic roofs, WorkSafe wants biocide put on with a low-pressure sprayer and the surface kept wet, with no high-pressure spraying or blasting at all. If yours could be either, make that a condition of the job.
Paint it, or is it past that?
Paint is worth it when the iron or tiles are sound and the problem is faded, chalky or thin paint with light surface rust. If rust has eaten through, or the iron is tearing at the fixings, paint won't save it.
Our repaint or re-roof guide and rusty iron roof guide go through the signs. For particular roofs, see painting an iron roof, painting a tile roof or painting a decramastic roof.
Repainting usually needs neither a building consent nor an LBP, so the painter's track record and the paint system they use matter more. Ask to see recent roofs they've done.
What makes a Nelson roof painting job bigger
Roof size and pitch set the baseline. Heavy rust, thick moss and lichen, sheets or fixings that need replacing first, and the paint system chosen all add to it.
Access is part of it too. WorkSafe treats roof painting that runs over several days as long-duration work, where scaffolding or edge protection should be considered, and says single-storey homes need the same fall protection as two-storey ones. A good written quote itemises the prep, the paint system and coats, and the fall protection, so you can compare like with like; see reading a roofing quote.
Ask these before you book a painter
- How will you prepare the roof: washing, moss and lichen treatment, rust spots?
- Which paint system, how many coats, and what does the manufacturer's warranty ask of me?
- What scaffolding or edge protection is included?
- If my roof could be asbestos cement or decramastic, will you clean it with a low-pressure sprayer only?
- How will you protect cars, gardens and windows from overspray?
- What happens if the weather turns halfway through?
Your part, and the painter's
You can
- Check the roof from the ground or an upstairs window for fading, chalking, rust spots and moss.
- Trim branches that rub on the roof or drop leaves on it, working from the ground.
- If you're unsure about asbestos, try our asbestos checker.
- Pick the colour, and confirm any heritage limits with the council.
Leave to a roofer
- Washing, moss treatment and rust treatment
- Replacing rusted sheets or failed fixings before painting
- Putting up edge protection or scaffolding
- Spraying or rolling the coats
If it were our Nelson roof
We'd book the repaint for late summer, ask for the prep to be itemised in the quote, and spend more on rust treatment than on a premium colour. Near the bay, we'd get any rust at the eaves and overhangs fixed first, because that's where salt does its damage. And if the house was built before 2000 and we weren't sure what the roof was, we'd have it tested before anyone washed it.
Want a roofer to take a look?
Tell us the job and your postcode. We match it with a Find My Roofer certified roofer who specialises in that kind of work, and they call you to quote. Your number goes to them alone.