Asbestos was once considered a miracle building material in Australia due to its strength, durability, fire resistance, and affordability. For decades, it was widely used in homes, commercial buildings, factories, sheds, and agricultural structures. One of the most common applications was asbestos roof sheeting.
Although asbestos products were banned in Australia in 2003, many older properties still contain asbestos roofing materials. If your home or building was constructed before the late 1980s, there is a possibility that asbestos roof sheeting may be present.
Knowing how to identify asbestos roofing and understanding what steps to take if you suspect its presence is crucial for protecting your health, complying with regulations, and maintaining your property’s value.
What Is Asbestos Roof Sheeting?
Asbestos roof sheeting is a building material made from a mixture of cement and asbestos fibres. It was commonly used because it was:
- Strong and durable
- Resistant to fire
- Weather-resistant
- Lightweight compared to other roofing materials
- Cost-effective
The most common form found in Australia is asbestos cement sheeting, often referred to as fibro or asbestos cement roofing.
These materials were extensively used on:
- Residential homes
- Garages
- Carports
- Sheds
- Factories
- Commercial buildings
- Rural and farming structures
While intact asbestos cement roofing generally poses a lower risk, damaged or disturbed asbestos can release hazardous fibres into the air.
Why Is Asbestos Dangerous?
The danger arises when microscopic asbestos fibres become airborne and are inhaled.
Exposure to asbestos fibres has been linked to serious health conditions, including:
- Mesothelioma: A rare and aggressive cancer affecting the lining of the lungs or abdomen.
- Asbestosis: A chronic lung disease caused by prolonged asbestos exposure.
- Lung Cancer: Long-term exposure to asbestos significantly increases the risk of lung cancer.
- Pleural Disease: Asbestos exposure can cause thickening and scarring of the lung lining.
One of the challenges with asbestos-related illnesses is that symptoms often do not appear until many years after exposure.
When Was Asbestos Roof Sheeting Used in Australia?
Asbestos-containing roofing materials were commonly used between the 1940s and the late 1980s.
General guidelines include:
- Homes built before 1985 have a higher likelihood of containing asbestos.
- Homes built between 1985 and 1990 may still contain asbestos products.
- Homes built after 1990 are less likely to contain asbestos.
- All asbestos-containing products were banned nationally in Australia in 2003.
If your property falls within these construction periods, it is worth investigating whether asbestos roofing is present.
How to Identify Asbestos Roof Sheeting
Identifying asbestos roofing can be difficult because it often resembles other cement-based roofing materials.
a. Look at the Age of the Property
One of the strongest indicators is the age of the building. Older homes and structures are more likely to contain asbestos materials.
b. Examine the Roofing Material
Asbestos cement roofing typically has:
- A grey or weathered appearance
- Corrugated or flat sheet profiles
- A cement-like texture
- No visible metal characteristics
Many older corrugated roof sheets found on garages, sheds, and rural buildings may contain asbestos.
c. Check for Manufacturer Markings
Some sheets contain markings or product stamps on the underside.
However, many older sheets have weathered over time, making identification difficult.
d. Consider the Condition
Asbestos roofing often becomes brittle and deteriorates with age. Signs may include:
- Cracking
- Chipping
- Surface erosion
- Moss or lichen growth
- Water damage
These conditions increase the likelihood of fibre release if the material is disturbed.
e. Arrange Professional Testing
The only reliable way to confirm the presence of asbestos is through laboratory testing.
A licensed asbestos removal professional can safely collect a sample and send it to an accredited laboratory for analysis.
Never attempt to cut, drill, sand, or break roofing materials to obtain a sample yourself.
Signs Your Asbestos Roof May Need Attention
Not all asbestos roofs require immediate removal. However, there are situations where action may be necessary.
Common warning signs include:
- Significant weathering
- Visible cracks or damage
- Roof leaks
- Renovation or demolition plans
- Loose roofing sheets
- Repeated exposure to high winds or storms
A professional inspection can determine whether the roof can remain in place safely or requires remediation.
What Should You Do If You Suspect Asbestos Roofing?
a. Do Not Disturb the Material
The most important rule is to avoid disturbing the roof.
Activities that can release fibres include:
- Pressure washing
- Drilling
- Sanding
- Grinding
- Cutting
- Scraping
Even routine maintenance can create airborne asbestos fibres if not performed correctly.
b. Arrange a Professional Assessment
Contact a licensed asbestos assessor or removal specialist to inspect the roof.
They can evaluate:
- The condition of the material
- Potential health risks
- Whether removal is necessary
- Legal compliance requirements
c. Consider Encapsulation
In some cases, asbestos roofing can be safely managed through encapsulation.
This process involves applying specialised coatings or sealants that help prevent fibre release and extend the life of the roof.
Encapsulation may be suitable when:
- The roof is in good condition
- No major renovations are planned
- Damage is minimal
However, it is not a permanent solution.
d. Plan for Removal if Necessary
If the roof is severely damaged or nearing the end of its lifespan, professional removal may be recommended.
Removal should only be performed by licensed asbestos removal contractors who follow strict safety procedures.
Asbestos Roof Removal in Australia
Removing asbestos roofing involves more than simply replacing old roof sheets.
Licensed removal contractors follow detailed procedures including:
- Site preparation
- Fibre containment
- Safe sheet removal
- Waste packaging
- Transport to approved disposal facilities
- Site decontamination
Strict regulations apply to protect workers, occupants, neighbours, and the environment.
Attempting DIY asbestos roof removal can be dangerous and may breach workplace health and safety regulations.
Cost of Asbestos Roof Removal
The cost of asbestos roof removal varies depending on:
- Roof size
- Accessibility
- Property location
- Roof condition
- Disposal requirements
- Replacement roofing needs
While costs can be significant, professional removal provides peace of mind and eliminates future asbestos-related concerns.
Obtaining multiple quotes from licensed asbestos removal companies is recommended.
Benefits of Replacing an Asbestos Roof
Many property owners choose to replace ageing asbestos roofs with modern roofing materials.
Benefits include:
- Improved Safety: Eliminates ongoing asbestos-related risks.
- Increased Property Value: Potential buyers often view asbestos roofing as a concern during property inspections.
- Better Energy Efficiency: Modern roofing materials typically offer improved insulation and thermal performance.
- Reduced Maintenance: New roofing systems generally require less maintenance and provide greater durability.
- Greater Peace of Mind: Knowing asbestos has been professionally removed provides long-term reassurance.
Legal Responsibilities for Property Owners
Property owners have a responsibility to manage asbestos risks appropriately.
This may involve:
- Identifying asbestos-containing materials
- Maintaining asbestos in safe condition
- Informing contractors about known asbestos
- Using licensed removal professionals when required
Requirements vary between states and territories, so it is important to seek advice from qualified asbestos specialists.
Final Thoughts
Asbestos roof sheeting remains a common issue across Australia, particularly in older homes, sheds, commercial buildings, and industrial properties. While asbestos roofing does not always require immediate removal, understanding how to identify it and knowing when to seek professional advice is essential.
If you suspect your property contains asbestos roof sheeting, avoid disturbing the material and arrange a professional inspection. Licensed asbestos specialists can assess the condition of the roof and recommend the safest course of action, whether that involves ongoing management, encapsulation, or complete removal.
Taking proactive steps today can help protect your health, ensure legal compliance, and safeguard the value of your property for years to come.