Replacing or choosing a roof is one of the biggest decisions a homeowner makes — it affects your home's weather-tightness, energy performance, resale value, and kerb appeal for decades. In New Zealand, three options dominate the residential market: long-run steel (corrugate or tray profiles), concrete tile, and metal tile (steel pressed to look like a traditional tile). Each has genuine strengths and real trade-offs. Here's an honest, practical breakdown to help you choose.
Overview of Each Option
Long-Run Steel
Long-run steel roofing — think classic corrugated iron or modern tray profiles like Corrugate, Trimdek, or Standing Seam — is the quintessential Kiwi roof. It's roll-formed from zinc/aluminium-coated steel (Zincalume) or pre-painted steel (Colorsteel), and fixed in long sheets that run from ridge to eave. Suppliers like James Hardie and major steel manufacturers supply product through merchants such as PlaceMakers and Mitre 10. It suits low-pitched roofs (as low as 3° for some profiles), is lightweight, and sheds water fast — ideal for NZ's high-rainfall regions.
Concrete Tile
Concrete tiles have been a popular choice on New Zealand homes since the 1970s and 80s. They're heavy, durable, and give a traditional look. However, their weight (around 40–50 kg/m²) means the roof structure must be engineered to handle the load — an important consideration for retrofits or earthquake-prone areas. Concrete tiles are porous and require periodic re-sealing or repainting to maintain their appearance and prevent moss/lichen growth, which is a real issue in NZ's damp climates.
Metal Tile
Metal tiles (sometimes called pressed metal tiles or stone-chip tiles) are steel panels pressed into a tile profile and coated with a stone-chip or painted finish. Brands like Gerard Roofs offer stone-chip coated options, while other manufacturers supply painted pressed metal tiles. They give the aesthetic of a tiled roof at a fraction of the weight of concrete, and they're faster to install. They suit a wide range of pitches and perform well in coastal and high-wind zones when correctly fixed.
Head-to-Head Comparison
| Criteria | Long-Run Steel | Concrete Tile | Metal Tile |
|---|---|---|---|
| Weight | Very light (4–8 kg/m²) | Heavy (40–50 kg/m²) | Light (7–12 kg/m²) |
| Durability | 40–70+ years (Colorsteel) | 50+ years (structure); surface degrades | 40–60+ years |
| Min. roof pitch | As low as 3° (profile dependent) | 15–17.5° minimum | 14–15° minimum |
| Appearance | Modern/industrial; classic corrugated | Traditional tiled look | Traditional tiled look, lighter |
| Maintenance | Low; check fixings & flashings | Moderate; re-seal, treat moss/lichen | Low–moderate; check fixings |
| Coastal suitability | Good (Colorsteel Maxx); check spec | Fair; salt can degrade surface | Good with correct coating |
| Seismic performance | Excellent (lightweight) | Poor–fair (heavy; adds load) | Excellent (lightweight) |
| DIY friendliness | Moderate (cutting, fixing) | Not recommended | Not recommended |
| Noise (rain) | Can be noisy without insulation | Quiet | Moderate |
| Approx. installed cost | Mid-range | Mid–high | Mid–high |
Cost figures vary significantly by region, roof complexity, and contractor. Always get at least three quotes.
NZ-Specific Considerations
New Zealand's climate varies enormously — from the dry, UV-intense Marlborough sun to the relentless rainfall of the West Coast and the salt-laden air of coastal Northland. The NZ Building Code sets minimum standards for roofing (primarily Clause E2 — External Moisture), and all roofing work must comply. BRANZ publishes excellent guidance on roof cladding performance in NZ conditions, including their Build magazine and appraisals.
Seismic loading is a genuine concern. Concrete tiles add significant mass to a structure, which increases earthquake forces on the building. In high-seismic zones (much of Wellington, Canterbury, Hawke's Bay), lightweight roofing is strongly preferred by structural engineers. If you're re-roofing an older home, switching from concrete tile to long-run steel or metal tile can actually improve your home's earthquake resilience.
Coastal zones require specific product grades. For long-run steel within 500 metres of the coast, specify Colorsteel Maxx or equivalent high-durability coatings, and ensure all fixings are stainless steel or appropriately rated. Check manufacturer warranties carefully — they often specify distance-from-coast limitations.
Cost Considerations
As a rough guide only, installed roofing costs in NZ (supply and labour) generally range from around $80–$130/m² for long-run steel, $100–$160/m² for metal tile, and $110–$180/m² for concrete tile — but these figures shift with roof complexity, access, region, and current material prices. A simple gable roof will always cost less than a complex hip-and-valley design regardless of material. Always get itemised quotes from licensed roofers.
Don't forget to factor in long-term costs: concrete tiles need periodic moss treatment and repainting (every 10–15 years in many NZ climates), which adds up. Long-run steel and metal tile generally have lower ongoing maintenance costs.
Maintenance and Longevity
All three systems require periodic inspection — at least every few years and after major storms. Key things to check include flashings (valleys, ridges, penetrations), fixings, and gutters. Moss and lichen are a widespread issue on concrete tiles in humid NZ regions; products are available, but prevention through correct ventilation and occasional treatment is easier than cure. Long-run steel can develop issues at cut edges or around fixings if the coating is damaged, so any scratches should be touched up promptly with a compatible paint such as those available from Resene.
Restricted Work and Safety
Roofing is height work and carries serious fall risks. WorkSafe NZ requires that anyone working at height follows safe work practices, including edge protection or fall arrest systems. While homeowners can legally do some roofing work on their own homes, the practical risks are significant. Structural alterations to support new roofing may require a building consent and must be carried out or supervised by a Licensed Building Practitioner (LBP). Always check with your local council before starting.
Our Recommendation
Choose long-run steel if: you have a low-pitched roof, want the lowest maintenance option, are in a high-seismic or high-wind zone, or prefer a clean modern aesthetic. It's the most versatile and typically the most cost-effective option for NZ conditions overall.
Choose metal tile if: you want the look of a tiled roof without the weight penalty of concrete — particularly good for re-roofing older homes where the structure wasn't designed for heavy tiles, or in coastal/seismic areas.
Choose concrete tile if: you're replacing like-for-like on a home already engineered for the load, you love the traditional look, and you're prepared for the maintenance commitment. It's less suited to re-roofing projects where structural upgrades would be needed.
For any roofing project, we strongly recommend getting quotes from qualified, experienced roofers. You can find trusted local roofing contractors on tradedirectory.co.nz.
Roofing Association of NZ (RANZ)
Licensed Building Practitioner (LBP)
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