If your home was built before the 1990s, there’s a good chance it may contain asbestos — and one of the most common places it can still be found is in the roofing.
Whether you’re planning a renovation, selling your home, or concerned about health risks, one question often arises:
Do I need to replace my asbestos roof?
In this detailed guide, we’ll explain:
- What asbestos roofing is
- The risks involved
- When it must be removed
- And how to go about replacing it safely
What Is Asbestos Roofing?
Asbestos roofing sheets, also known as fibro, were commonly used in Australian homes and commercial buildings between the 1940s and late 1980s. The product typically combined asbestos fibres with cement, creating strong, durable, fire-resistant roofing panels.
Asbestos was commonly used in:
- Corrugated cement roof sheeting
- Roof shingles and tiles
- Eaves and gable ends
- Flashings and downpipes
Is an Asbestos Roof Dangerous?
Yes, but only under certain conditions. Asbestos roofing is usually made of bonded (non-friable) asbestos, which means the fibres are locked into the material. In its intact form, it may not immediately release dangerous fibres. However, problems arise when the roof:
- Begins to deteriorate with age or weather exposure
- Is drilled, cut, sanded, or broken
- Is damaged during storms
- Starts to crack, crumble, or delaminate
In these cases, toxic asbestos fibres can become airborne, posing serious health risks including:
- Mesothelioma
- Asbestosis
- Lung cancer
Signs You Should Replace Your Asbestos Roof
Here are the main warning signs that it’s time to consider asbestos roof removal or replacement:
1. Visible Damage or Cracks
If the sheets are broken, chipped, or sagging, it may be releasing fibres.
2. Roof Leaks or Moisture Penetration
Asbestos cement sheets are porous over time. Leaks indicate deterioration.
3. Heavy Moss, Lichen, or Algae Growth
Organic growth breaks down the surface of asbestos, speeding up decay.
4. Age of the Roof (30+ Years)
Most asbestos roofing is well past its intended lifespan and is now considered a liability.
5. You’re Planning Renovations or Selling
Renovating a home with asbestos can be dangerous without proper removal. Buyers also tend to avoid properties with asbestos roofs.
Can I Repair an Asbestos Roof Instead?
Technically, minor repairs can be made, but this is generally not a long-term solution.
Common temporary options include:
- Sealing or encapsulating the asbestos sheets
- Patching small cracks with compatible roofing products
- Recoating the surface with asbestos-safe paint systems
However, these are only band-aid fixes and don’t eliminate the health risk. Professional advice is essential, and in many cases, full removal is more cost-effective over time.
Do I Legally Have to Remove an Asbestos Roof?
In Australia, you’re not legally required to remove an asbestos roof unless:
- It’s damaged or deteriorating
- You’re conducting renovations that may disturb it
- The structure is being demolished
- It poses a documented safety risk
However, leaving asbestos in place without monitoring or maintenance is no longer considered best practice — especially on exposed surfaces like a roof.
How Is an Asbestos Roof Replaced?
Here’s a basic overview of the process when you hire a licensed asbestos removal contractor:
- Site inspection & testing
- Identify materials and confirm asbestos presence.
- Permit & notification to SafeWork (NSW)
- Required for removal over 10 square metres.
- Safe removal
- Using full PPE, safety controls, water suppression, and containment procedures.
- Disposal at a licensed facility
- Followed by full decontamination of the site.
- Replacement with new roofing materials
- Colorbond, metal roofing, or tile, depending on budget and style.
- Air monitoring & clearance certificate
- Ensures no residual fibres remain on the property.
What Is the Cost of Replacing an Asbestos Roof?
Costs vary based on:
- Size and pitch of the roof
- Roof access (single vs multi-storey)
- Type of replacement material
- Condition of the existing roof
On average in Australia, asbestos roof removal and replacement can range from $100 to $150 per square metre, all-inclusive. It may be higher for steep roofs or double-storey homes.
Tip: Some councils or governments may offer grants or rebates for asbestos removal — check your local area.
Pros of Replacing Your Asbestos Roof
- Eliminates long-term health risk
- Increases property value
- Improves insulation and energy efficiency
- Modern roofing requires less maintenance
- Easier future renovations or extensions
When Can You Leave an Asbestos Roof in Place?
There are limited cases where asbestos roofing can remain temporarily, if:
- It’s in perfect condition
- Not being disturbed or drilled
- Sealed or encapsulated professionally
- Monitored regularly by qualified assessors
However, even in this case, experts often recommend planning for future replacement.
Final Thoughts: Is It Time to Replace Your Asbestos Roof?
If your asbestos roof is:
- Over 30 years old
- Cracked, leaking, or breaking down
- Covered in moss or damaged by weather
- A concern during renovation or resale
…then yes, it’s time to replace it.
While asbestos removal may seem expensive upfront, it pays off in long-term safety, peace of mind, and property value. Always use licensed asbestos removal professionals for roof work — never attempt it yourself.
Get Expert Advice on Asbestos Roof Removal
Not sure if your roof contains asbestos or needs replacement?
Contact, your local licensed asbestos removal experts, for an inspection and free quote.