How Long Do Asbestos Roofs Last? What New Zealand Property Owners Should Know

Asbestos roofing was once a popular choice across New Zealand because of its strength, fire resistance, and low cost. Many homes, garages, farm sheds, and commercial buildings constructed before the 1990s still have asbestos cement roofing today.

Average Lifespan of Asbestos Roofing

Asbestos cement roofs were built to be durable. When installed correctly and left undisturbed, these roofs can remain in place for 30 to 60 years or more. However, age alone doesn't tell the full story. Over time, exposure to sun, wind, rain, and temperature changes slowly weakens the roofing material. As the cement binding breaks down, the sheets become more fragile and prone to cracking. This is why older asbestos roofs may still look fine on the surface but can be structurally and safety-wise at risk.

What Affects the Life of an Asbestos Roof?

Several factors determine how long your asbestos roof will hold up:

Weather Conditions: New Zealand's changing climate - strong UV rays, coastal salt air, heavy rainfall, and storms - can speed up material deterioration
Installation Quality: Roofs that were professionally installed with correct fixings and support usually last longer than those installed poorly or modified later.
Maintenance History: Roofs that have been regularly inspected and kept free of heavy moss and debris tend to stay in better condition.
Roof Usage: Roofs that have been walked on, drilled into, or disturbed for solar panel installation or repairs often deteriorate faster.

What Affects the Life of an Asbestos Roof?

Several factors determine how long your asbestos roof will hold up:

Persistent dry cough
Shortness of breath
Chest pain or tightness
Fatigue and reduced stamina
Wheezing or difficulty breathing
Unexplained weight loss (in advanced cases)

If you live in Wellington and have worked in older buildings or recently renovated a pre-1990 property, it is important to take these symptoms seriously.

Warning Signs Your Asbestos Roof May Need Attention

If your property has asbestos roofing, watch for these common warning signs:

Cracked or broken roof sheets
Visible surface erosion or flaking
Water leaks inside the building
Loose or shifting panels
Heavy moss or algae buildup
Pieces breaking during light contact

These signs usually mean the roof is reaching the end of its safe lifespan.

Why Older Asbestos Roofs Can Become Dangerous

Asbestos roofing is considered lower risk when it remains sealed and intact. The problem starts when the material becomes brittle and damaged.

When asbestos sheets crack or crumble, microscopic fibres can become airborne. Breathing in these fibres can lead to serious long-term health issues. This is why attempting DIY repairs or pressure washing asbestos roofs is strongly discouraged.

At Asbestos Removal NZ, we always recommend professional assessment before any work is carried out.

Should You Repair or Replace an Asbestos Roof?

In some cases, short-term sealing or encapsulation may be possible if the roof is still in good condition. However, for older or heavily weathered roofs, full removal and replacement is often the safest long-term solution.

Replacing asbestos roofing not only improves safety but also increases property value, enhances insulation options, and reduces future maintenance concerns.

Professional Assessment Makes All the Difference

Every asbestos roof is different. The best way to understand your roof's true condition is through a professional inspection. Our experienced team at Asbestos Removal NZ can assess your roofing, explain your options clearly, and carry out safe, compliant removal if required.

Need Help With Asbestos Roofing?

If you're unsure about the condition of your asbestos roof or planning renovations, don’t take risks.

Contact Asbestos Removal NZ today for expert advice, safe asbestos roof removal, and peace of mind.