Two categories, very different risk profiles
When asbestos is identified in a building, one of the first things an assessor will determine is whether it's friable or non-friable. This classification drives everything that follows: how dangerous the material is, what regulations apply, who can remove it, and how urgently you need to act.
Getting this distinction right matters. It directly affects your legal obligations and the safety of anyone working in or around the building.
What is friable asbestos?
Friable asbestos is any material containing asbestos that can be crumbled, pulverised, or reduced to powder by hand pressure when dry. The fibres are loosely bound and can become airborne with minimal disturbance.
Common examples include:
- Sprayed-on insulation and fireproofing (sometimes called "limpet" spray)
- Pipe lagging and boiler insulation
- Loose-fill insulation in ceiling cavities
- Asbestos rope and woven textile products
- Millboard used behind heaters and in fire doors
Because the fibres release so easily, friable asbestos represents the highest risk category. Even minor disturbance, like brushing past pipe lagging or working above a ceiling with loose-fill insulation, can release dangerous concentrations of fibres into the air.
What is non-friable asbestos?
Non-friable asbestos (sometimes called "bonded asbestos") is material where asbestos fibres are locked within a binding matrix, typically cement, vinyl, or resin. In its intact state, the fibres are not easily released.
This is the more common type found in Australian and New Zealand buildings. Examples include:
- Fibre cement (fibro) sheeting for walls, eaves, and fencing
- Corrugated asbestos cement roofing
- Vinyl floor tiles and vinyl sheet flooring
- Compressed cement pipes
- Imitation brick cladding
When these materials are in good condition and undisturbed, the risk of fibre release is low. That's the key qualifier though: "in good condition and undisturbed."
Why the distinction matters for regulation
Australian and New Zealand regulations treat friable and non-friable asbestos very differently.
Friable asbestos can only be removed by a Class A (or equivalent) licensed removalist. The work requires full containment, negative air pressure, decontamination facilities, and air monitoring by an independent occupational hygienist. Clearance certificates are required before the area can be reoccupied.
Non-friable asbestos removal requires a Class B licence and still comes with strict controls, but the requirements are less intensive. Smaller quantities (typically under 10 square metres) may be removable without a licence in some jurisdictions, though this varies and professional removal is always recommended.
The penalties for getting the classification wrong and using the wrong removal procedures are serious, both financially and in terms of health consequences.
When non-friable becomes friable
Here's where things get tricky for property managers. Non-friable asbestos doesn't stay non-friable forever.
Over time, weathering, water damage, physical impact, or poor maintenance can break down the binding matrix. Once that happens, fibres start to loosen and the material effectively becomes friable. A cement sheet that was low-risk when installed 40 years ago can become high-risk after decades of exposure to the elements.
Common causes of this transition include:
- Weathering and UV degradation on exterior cladding and roofing
- Water damage from leaks or flooding
- Physical damage from impacts, drilling, cutting, or sanding
- Chemical exposure
- General ageing and deterioration
This is one of the main reasons regular condition assessments are so important. An asbestos register is not a one-time document. The condition of materials changes, and your management approach needs to change with it.
What this means in practice
If you manage a building with known or suspected asbestos, the friable vs non-friable classification should be clearly recorded in your asbestos register. A qualified asbestos assessor will make this determination during a survey and assign a risk rating to each material found.
For non-friable materials in good condition, management in place (leaving the material undisturbed and monitoring its condition) is often the appropriate strategy. For friable materials, or non-friable materials that have deteriorated significantly, removal or encapsulation may be necessary.
Either way, any work that might disturb asbestos materials needs to be carried out by appropriately licensed professionals. If you're unsure about the condition or classification of asbestos in your building, an asbestos surveyor or consultant can assess the situation and recommend next steps.