If your tools have contacted asbestos cement materials — such as old fibro cladding, roofing sheets, or eaves linings common in NZ homes built before the mid-1980s — it's critical that you clean them using wet methods only and handle all waste as asbestos-contaminated material. Dry brushing or blowing off dust is never acceptable, as it can release dangerous asbestos fibres into the air.
Understand the Risk First
Asbestos cement (sometimes called "fibro" or "AC sheet") contains bonded asbestos fibres that are relatively stable when intact, but can release fine fibres when cut, drilled, sanded, or disturbed. Even residue left on tools can become a hazard if it dries out and is later disturbed. WorkSafe NZ sets out clear guidance on managing asbestos risks, and their rules apply to homeowners as well as tradespeople.
Before You Start: Gear Up Properly
Never attempt to clean contaminated tools without the right personal protective equipment (PPE):
- P2-rated disposable respirator (not a basic dust mask)
- Disposable coveralls (Tyvek-style)
- Nitrile gloves (at least two pairs)
- Safety glasses or goggles
Put on your PPE before handling any tools. Work outdoors or in a well-ventilated area away from other people, pets, and HVAC intakes.
Step-by-Step: Wet Cleaning Your Tools
1. Prepare Your Cleaning Station
Set up a dedicated area on a sheet of heavy-duty plastic (at least 0.2 mm thick). Have a bucket of water with a small amount of liquid detergent mixed in, plus a second bucket of clean rinse water. Lay out your sealed asbestos waste bags nearby — these should be labelled asbestos waste bags (double-bagged, heavy-duty plastic).
2. Wet-Wipe All Surfaces
Using damp cloths or disposable paper towels soaked in your soapy water, wipe down every surface of each tool — handles, blades, heads, and any crevices. The goal is to capture fibres with moisture rather than disturb them into the air. Never use compressed air, dry rags, or a dry brush.
Repeat the wipe-down at least twice, using fresh damp cloths each time. For tools with grooves or joints (e.g., saw teeth, drill chucks), use a damp toothbrush-style brush to work into gaps — always keeping surfaces wet.
3. Rinse Carefully
Rinse tools in your second bucket of clean water, again keeping everything wet. Do not use a hose on full pressure, as this can splash contaminated water and spread fibres.
4. Dispose of All Cleaning Materials as Asbestos Waste
Every cloth, paper towel, glove, and the plastic sheeting from your work area must be treated as asbestos-contaminated waste. Place all materials into your labelled asbestos waste bags, seal them securely, and double-bag. Your local council will advise on approved disposal sites — not all transfer stations accept asbestos waste, so check before you go.
5. Remove PPE Safely
Remove disposable coveralls by rolling them inward (inside-out) to contain any surface contamination. Place coveralls, gloves, and your respirator filter into the waste bag before sealing. Wash your hands and face thoroughly with soap and water.
What to Do With Heavily Contaminated Tools
If a tool has been used to cut, grind, or drill asbestos cement — rather than simply coming into contact with intact material — it may be deeply contaminated in ways that wet wiping cannot fully address. In this situation, the safest option is often to dispose of the tool as asbestos waste rather than attempt to clean it. Consult a licensed asbestos removalist for advice.
Disposing of Asbestos Waste in NZ
Asbestos waste must be disposed of at a facility approved to accept it. Contact your local council or regional authority to find your nearest approved site. Waste must be:
- Double-bagged in heavy-duty plastic
- Clearly labelled "ASBESTOS WASTE — DANGER"
- Not mixed with general rubbish
Never place asbestos waste in your kerbside bin.
A Note on NZ Regulations
Under NZ law, any asbestos removal work exceeding 10 m² must be carried out by a licensed asbestos removalist (Class A or Class B licence, depending on the type of asbestos). Even for smaller areas, WorkSafe NZ requires that work be planned and carried out safely. If you're unsure whether your situation falls within the legal DIY threshold, always check with WorkSafe or a licensed professional before proceeding. You can find licensed asbestos removal specialists on tradedirectory.co.nz.
When to Call a Professional
Call a licensed asbestos removal specialist if:
- The area of asbestos cement disturbed exceeds 10 m²
- You are unsure whether the material actually contains asbestos (testing by an accredited laboratory is the only way to confirm)
- Tools were used to cut, grind, or drill the material (not just surface contact)
- Anyone in the household has respiratory conditions or is immunocompromised
- You feel uncertain about any part of the process
A licensed removalist has the training, equipment, and legal authority to handle, clean, and dispose of asbestos materials safely. Don't take risks with something as serious as asbestos exposure — find a qualified specialist on tradedirectory.co.nz.
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