If your home was built before the year 2000, there is a real chance it contains asbestos-containing materials (ACMs). New Zealand used asbestos extensively in residential construction right up until it was banned for most uses in the late 1980s and early 1990s, and some products containing it remained in use or in stock even after that. The good news is that knowing what to look for — and what to do about it — can keep your family safe.
Why Asbestos Was So Common in NZ Homes
Asbestos was prized by builders for decades because it is fire-resistant, durable, and a good insulator. In New Zealand, it was incorporated into a huge range of building products. Homes built roughly between the 1940s and 1990s are most likely to contain ACMs, but even some early-2000s builds may include materials manufactured before the ban took full effect.
The key rule of thumb: if your home is older than about 25–30 years, treat any suspect material as potentially containing asbestos until proven otherwise.
Where Asbestos Hides in a Typical NZ Home
Asbestos can turn up in many places, often in materials that look perfectly ordinary. Common locations include:
- Exterior cladding and soffits — flat or corrugated fibre-cement sheets (sometimes called "fibrolite" or "super six") were a very popular NZ cladding product and frequently contained asbestos
- Roof cladding — corrugated asbestos-cement roofing was widely used on garages, sheds, and older homes
- Internal wall and ceiling linings — flat compressed sheets used before GIB plasterboard became standard
- Floor tiles and vinyl flooring — the tiles themselves and the adhesive (mastic) beneath them can both contain asbestos
- Textured ceiling coatings — "popcorn" or stippled ceilings applied before the 1980s sometimes contained asbestos fibres
- Pipe and duct lagging — insulation wrapped around hot-water pipes, heating ducts, and boilers
- Backing on carpet and linoleum
- Brake linings and gaskets in older outbuildings or workshops
- Putty and rope seals around old fireplaces and wood burners
Can You Tell Just by Looking?
Unfortunately, you cannot reliably identify asbestos by sight alone. Asbestos fibres are microscopic, and ACMs look identical to non-asbestos versions of the same product. Even experienced tradespeople cannot confirm the presence of asbestos without laboratory testing.
What you can do is assess the likelihood based on:
| Factor | Higher Risk | Lower Risk |
|---|---|---|
| Age of home | Pre-1990 | Post-2000 |
| Cladding type | Fibrolite / corrugated cement sheet | Timber weatherboard, brick |
| Ceiling finish | Textured / stippled | Smooth plasterboard |
| Floor covering | Old vinyl tiles, dark mastic adhesive | Modern floating floor |
| Roof material | Corrugated cement sheet | Steel, timber shingles |
How to Get Your Home Tested
The only way to confirm whether a material contains asbestos is to have a sample analysed by an accredited laboratory. Here is the safe process:
- Do not disturb the material yourself. Cutting, sanding, drilling, or breaking ACMs releases fibres into the air — this is where the health risk lies. Intact, undisturbed asbestos is generally considered lower risk.
- Engage a licensed asbestos assessor or removalist to take samples safely. They have the correct personal protective equipment (PPE) and training to do this without spreading contamination.
- Laboratory analysis — samples are tested using polarised light microscopy or transmission electron microscopy at an accredited NZ lab. Results typically come back within a few days.
- Receive a written report detailing which materials contain asbestos, the type (friable or non-friable), and recommended management or removal options.
WorkSafe NZ publishes detailed guidance on asbestos management, including the regulations that apply to both workplaces and residential properties.
Understanding Friable vs Non-Friable Asbestos
- Non-friable (bonded) asbestos — fibres are locked into a solid matrix (e.g., cement sheet). Lower immediate risk if left undisturbed, but dangerous when cut or broken.
- Friable asbestos — can be crumbled by hand pressure (e.g., pipe lagging, some insulation). Higher risk because fibres are more easily released into the air.
Friable asbestos removal is Class A licensed work under New Zealand regulations and must only be carried out by a licensed removalist. Non-friable (Class B) removal also requires a licensed removalist for areas above a certain threshold.
What the NZ Law Says
The Health and Safety at Work (Asbestos) Regulations 2016 set out clear rules for asbestos identification, management, and removal. Under these regulations:
- Any removal of friable asbestos must be done by a Class A licensed asbestos removalist
- Removal of non-friable asbestos above the prescribed area threshold must be done by a Class B licensed removalist (or Class A)
- An asbestos assessor (separately licensed) must be engaged for certain higher-risk removal jobs to provide clearance certificates
As a homeowner doing minor DIY maintenance on your own home, there is a very limited exemption for small amounts of non-friable material — but the safest approach is always to get a professional involved. Check MBIE Building Performance for guidance on when building consent may also be required during renovation work.
BRANZ also has research and guidance on asbestos in NZ buildings that is worth reading before you start any renovation project.
When to Call a Professional
Call a licensed asbestos specialist immediately if:
- You are planning any renovation, demolition, or alteration to a pre-2000 home
- You have discovered damaged, crumbling, or disturbed material you suspect may be asbestos
- You are buying or selling an older property and want a clear picture of what you are dealing with
- A tradesperson has flagged a suspect material during other work
Do not attempt to remove or disturb suspect materials yourself. Asbestos-related diseases — including mesothelioma and asbestosis — are serious and can develop years after exposure. The risk is simply not worth taking.
You can find licensed asbestos removal specialists in your area on tradedirectory.co.nz.