Hand-sanding old Villaboard walls is not safe if there is any chance the material contains asbestos. Even gentle, dry sanding can release microscopic asbestos fibres into the air, and once inhaled, those fibres can cause serious, irreversible diseases including mesothelioma and asbestosis. Before you pick up a sanding block, you need to understand the risks, your legal obligations, and the right steps to take.
What Is Villaboard and Why Might It Contain Asbestos?
Villaboard is a fibre-cement sheet product manufactured by James Hardie and commonly used in New Zealand kitchens, bathrooms, and wet areas as a wall lining. Older versions of Villaboard — generally those installed before the mid-1980s — were manufactured using chrysotile (white) asbestos as a reinforcing fibre. James Hardie phased asbestos out of their products progressively, but if your home was built or renovated before around 1987, there is a real possibility that the Villaboard in your walls contains asbestos.
You cannot tell by looking at it whether a sheet contains asbestos. The only way to know for certain is to have a sample tested by an accredited laboratory.
Why Sanding Is Particularly Dangerous
Asbestos-containing materials (ACMs) are generally classified as either friable (easily crumbled) or non-friable (bonded). Intact, undisturbed Villaboard is considered non-friable — the asbestos fibres are locked into the cement matrix and pose a lower risk when left alone.
However, sanding changes everything. Any abrasive action — including hand-sanding — breaks down the cement matrix and releases asbestos fibres as fine dust. This dust is invisible to the naked eye and can remain suspended in the air for hours. There is no known safe level of asbestos fibre exposure. This is why WorkSafe NZ treats any disturbance of ACMs as a serious health hazard requiring strict controls.
NZ Legal Requirements for Asbestos Work
Under the Health and Safety at Work (Asbestos) Regulations 2016, asbestos removal work in New Zealand is tightly regulated:
- Class A removal covers friable asbestos and must be carried out by a licensed Class A asbestos removalist.
- Class B removal covers non-friable ACMs (such as intact fibre-cement sheet) in quantities greater than 10 m², and must be done by a licensed Class B removalist.
- Homeowners working on their own home may carry out minor disturbance of non-friable ACMs under 10 m², but this still requires strict controls — proper P2 respirator, disposable coveralls, wet methods where possible, and correct disposal.
- Sanding is explicitly a high-risk activity because it generates airborne dust, and WorkSafe guidance strongly recommends engaging a licensed professional regardless of area size.
Always check the current regulations with WorkSafe NZ before starting any work, as requirements can change.
Steps to Take Before Any Work Begins
1. Assume It Contains Asbestos Until Proven Otherwise
If your home was built or renovated before 1990, treat all fibre-cement sheeting as potentially containing asbestos. This is the approach recommended by BRANZ, New Zealand's building research authority.
2. Arrange Asbestos Testing
Hire a qualified asbestos assessor to take a sample and have it analysed by an accredited laboratory. Do not attempt to sample the material yourself by sanding or breaking it — use a professional who knows how to take a sample safely.
3. Review the Results and Plan Accordingly
If asbestos is confirmed:
- Do not sand, drill, cut, or otherwise disturb the material.
- Consult a licensed asbestos removalist about your options — removal, encapsulation, or leaving it undisturbed may all be appropriate depending on the condition and your renovation plans.
- Check MBIE Building Performance for guidance on whether your planned work requires a building consent.
What Are Your Alternatives to Sanding?
If you need to prepare a Villaboard surface for repainting or retiling and asbestos is present, discuss these options with a professional:
| Option | Notes |
|---|---|
| Encapsulation | Sealing the surface with a suitable primer/paint without sanding — only suitable if the surface is in good condition |
| Overlay | Fixing new lining over the top, avoiding disturbance |
| Licensed removal | Full removal by a Class A or B removalist before renovation proceeds |
| Leave undisturbed | If the material is in good condition and won't be disturbed, this is often the safest short-term option |
For painting products compatible with fibre-cement surfaces, Resene and Dulux both offer suitable primers and topcoats — but only apply these if the surface has been confirmed asbestos-free or professionally encapsulated.
When to Call a Professional
You should engage a licensed asbestos assessor or removalist if:
- Your home was built or renovated before 1990 and you haven't had the Villaboard tested.
- Testing has confirmed asbestos is present.
- The area involved is greater than 10 m².
- You are planning any renovation work — sanding, cutting, drilling, or removing — that will disturb the sheeting.
- The material is damaged, crumbling, or deteriorating.
Licensed asbestos removal specialists can be found right here on tradedirectory.co.nz. Choosing a licensed professional protects your health, your family's health, and ensures the work meets NZ legal requirements.
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