Can you maintain your fibre cement roof yourself? Here’s the answer
Can you maintain your fibre cement roof yourself? Here’s the answer
Fibre cement roofs are a common sight on New Zealand homes, especially those built from the 1970s onwards. They’re durable, low‑maintenance, and well suited to the country’s varied climate – from coastal salt air to alpine frost. But even though fibre cement is tough, it still needs care. The question is: can you look after it yourself, or should you call in a professional? Here’s the answer – and a guide to what you can, may, and should do.
What exactly is a fibre cement roof?
Fibre cement is a mix of cement and reinforcing fibres that makes the material strong, weather‑resistant, and long‑lasting. Older sheets (installed before the late 1980s) often contain asbestos, while modern ones are asbestos‑free. That difference matters, because it determines what kind of maintenance you’re legally and safely allowed to do.
A well‑maintained fibre cement roof can last 30–50 years, depending on the quality of the sheets, the local climate, and how well it’s cared for. Over time, you may notice moss, lichen, or small cracks that need attention.
Are you allowed to maintain it yourself?
The short answer is: Yes – but with important conditions.
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If your roof contains asbestos (common in sheets installed before 1988), you must not clean, sand, drill, or cut it yourself. Asbestos fibres are hazardous when disturbed, and any work must be done by licensed asbestos removal professionals. You can, however, safely clear leaves from gutters and keep the area around the roof tidy.
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If your roof is asbestos‑free, you can handle basic maintenance tasks yourself – such as removing debris, cleaning gutters, and checking for damage. But you need to do it carefully to avoid damaging the surface or compromising the protective coating.
How to check whether your roof contains asbestos
If you’re unsure, look for markings on the back of the sheets. Newer, asbestos‑free products are often labelled “AF” (asbestos‑free) or “NT” (new type). If you can’t find a marking, you can have a small sample tested by an accredited laboratory or ask a roofing specialist to inspect it. It’s a small cost that can prevent serious health and legal issues later.
Routine maintenance – what you can do yourself
If your roof is confirmed asbestos‑free, you can safely carry out a few simple maintenance tasks:
- Clean gutters and downpipes at least once a year so rainwater drains freely.
- Remove leaves, branches, and debris from the roof surface, especially after storms.
- Watch for moss and lichen. A light growth isn’t harmful, but thick layers can trap moisture and shorten the roof’s lifespan.
- Inspect for cracks, loose fixings, or lifted sheets. Small issues can quickly become leaks if ignored.
Always use proper safety gear and avoid walking directly on the sheets – they can crack under weight, particularly if they’re older or weathered.
Cleaning and recoating – when to call the professionals
While you can handle light maintenance, larger jobs are best left to experts:
- Roof cleaning: Professionals use low‑pressure washing and approved cleaning agents that won’t damage the surface. High‑pressure water can strip the protective coating and weaken the sheets.
- Recoating or painting: A new surface treatment can extend the roof’s life, but it requires the right materials and technique to ensure durability.
- Repairs or replacements: Cracked or porous sheets should be replaced by a qualified roofer, especially if there’s any chance they contain asbestos.
Signs your roof needs professional attention
Keep an eye out for these warning signs:
- Persistent dark stains or discolouration that don’t wash off
- Cracks, flaking, or soft spots in the sheets
- Leaks or damp patches in the ceiling
- Moss or lichen growing in the joints between sheets
The sooner you get a professional inspection, the easier – and cheaper – it usually is to fix the problem.
How to extend your roof’s lifespan
A fibre cement roof can last for decades if you look after it properly. Here are some good habits:
- Do an annual roof check, ideally in spring, after winter weather.
- Ensure good roof‑space ventilation to prevent moisture build‑up.
- Trim overhanging trees to reduce shade and debris accumulation.
- Arrange a professional inspection every 5–10 years to catch early signs of wear.
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Conclusion: You can do a lot yourself – but not everything
You can certainly handle the light maintenance of an asbestos‑free fibre cement roof. Keeping it clean, dry, and damage‑free will go a long way toward preserving it. But if your roof contains asbestos, or if you need deep cleaning, recoating, or repairs, always call a licensed professional.
By knowing where to draw the line between DIY and expert work, you’ll protect both your home and your health – and help your roof last for many more New Zealand seasons.
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