Roof Painting Johnsonville Wellington

Johnsonville carries a lot of Wellington's state housing history, and those roofs are reaching an age where they need attention. Corrugated iron from the 1930s to 1950s is tough material — built to last — but decades of exposure to westerly gales coming through the northern valley have taken a toll. Rust, chalking paint, and dried-out ridge caps are common on these properties. The good news is most of them are paintable, and a quality job now adds another fifteen to twenty years of life.

Why Choose Our Roof Painting

State House Era Iron — We Know What to Expect

Roofs from this period have specific characteristics. The iron profile is typically shallower than modern roofing, the laps can be open in places, and ridge caps are often the first thing to fail. Rust tends to concentrate around fasteners and at the laps where water sits. We assess all of this before we quote, so there are no surprises on the job. We've worked on enough of these roofs to have a clear sense of what preparation they need and what paint systems work best on aged iron.

Westerly Exposure — Preparation Matters

The westerlies that funnel through the Johnsonville valley drive moisture into every gap. Roofs here can look sound on the surface but have active moisture damage underneath the paint film at the laps and around any penetrations. We probe as part of our inspection, and we treat those areas properly before applying any new paint. Wind-driven rain is also the reason we use high-build primers on these roofs — a thin paint system won't hold up in this exposure.

Registered Master Painters

Wellington Decorators are Registered Master Painters. Whether it's a modest state house or a larger property, every job is done to the same standard and backed by a workmanship guarantee. We don't cut corners on preparation because that's where the long-term result is won or lost.

Our Roof Painting Process

We follow a thorough process on every Johnsonville roof. First, a detailed inspection — checking rust depth around fasteners and laps, condition of ridge caps and flashing, and any open or lifted sections. Second, a full high-pressure wash to remove oxidised paint, grime, and any biological growth. Third, biocide treatment where moss or lichen is present. Fourth, rust converter applied to all corroded areas, then a high-build oil-based primer on bare metal and a full-surface primer coat. Fifth, two coats of quality roof paint from Dulux, Resene, or Wattyl — products with proven performance in New Zealand conditions. We allow full dry time between coats and don't paint in wind.

What's Included

Every roof painting job in Johnsonville includes:

• Detailed inspection with written condition report
• High-pressure water blasting
• Biocide wash where needed
• Rust converter on corroded sections
• High-build oil-based primer on bare metal
• Full surface primer coat
• Two full coats of premium roof paint
• Ridge cap and flashing inspection
• Site cleanup on completion
• Workmanship guarantee

Cost Guide

State era roofs often require more rust treatment and primer work than modern roofs of the same size, so preparation costs can be higher. As a general guide: small roofs up to 80m² range from $3,500 to $6,000. Medium roofs from 80–150m² run $6,000 to $10,000. Larger roofs above 150m² are generally $10,000 to $18,000. We provide fixed-price written quotes after inspecting the roof. You know the full cost upfront with no variations after the work starts.

FAQs

My roof is from the 1940s. Is it worth painting or should I replace it?

If the iron is structurally sound — no perforations, no failed laps — then painting is almost always the better option. Roof replacement is significantly more expensive, and well-maintained old iron painted with a quality system can last another fifteen to twenty years. We'll give you an honest assessment when we inspect it.

What causes the rust around the screws?

Older roofs often have steel screws or nails that have corroded, and the rust bleeds into the surrounding paint. We treat each fastener individually — removing failed fixings, treating the hole, and replacing with stainless steel screws before priming and painting.

The ridge cap cement is cracking. Is that a painting issue?

Cracked or failing ridge cap mortar is a separate issue but one we address before painting. We re-bed and repoint cracked ridge caps as part of our pre-paint preparation where needed. If the mortar is failing, painting over it just hides the problem.

How long will the job take?

Most Johnsonville state house-era roofs take three to four days. The rust treatment and high-build primer add time compared to a modern roof, but skipping those steps just means doing the job again in five years.

Areas We Cover

We cover Johnsonville and surrounding northern suburbs including Newlands, Paparangi, Grenada North, Churton Park, and Broadmeadows. If you're not sure whether we cover your street, give us a call.

Get a Free Quote

If your Johnsonville roof has rust, chalking paint, or ridge cap problems, don't leave it until the damage gets worse. We offer free, no-obligation inspections and give you a fixed-price written quote. Visit our roof painting page for more details, or contact us to book an inspection at a time that suits you.