How long does a roof last?
The lifespan of roofing materials in Australia varies significantly based on type, quality, and local environmental conditions. In general, more robust materials like slate or zinc can outlast others, but all materials last less if exposed to harsh environments, such as extreme heat, humidity, storms, or coastal salt.
Lifespans of Common Roofing Materials
| Roofing Material | Avg Lifespan Australia | Notes on Durability |
|---|---|---|
| Colorbond (coated steel) | 40–70 years | Highly resistant to corrosion, especially in harsh climates |
| Concrete Tiles | 50–70 years | Affordable and durable; proper maintenance is key |
| Slate Tiles | 80–100+ years | Very durable, expensive, and less common |
| Corrugated Iron/Tin | 25–60 years | Prone to rust in coastal areas, but good with care |
| Steel (plain) | 35–50 years | Robust but can corrode without coatings |
| Copper | 40–80 years | Robust, may corrode in high rainfall areas |
Key Environmental Factors
- Tropical/Coastal Areas: Salt, humidity, and storms can significantly reduce lifespan for many materials except specially-coated ones like Colorbond.
- Dry, Hot Inland: Extreme UV and heat can cause tiles to crack or become brittle and shorten roof life.
- Installation & Maintenance: Quality installation and regular inspections can prolong the lifespan of any roof material, catching problems early.
Summary
- Longest life: Slate, clay, or zinc roofs (often over 80 years with good care).
- Most common, good longevity: Colorbond, terracotta, or concrete tile roofs (typically 40–75 years).
- Short lifespan: Asphalt shingles and membrane roofs (often under 25 years, rarely recommended for Australian climates).
Selecting a roof should balance material longevity against climate, budget, architectural needs, and willingness for regular maintenance. Note that in Accounting Standards, regard should be had not only to its material design life, the Economic Useful Life must be considered.
