Suspected asbestos uncovered mid-renovation on a 1978 state house
On a 1978 state house renovation in Porirua, two workers are stripping the hallway ceiling linings to install a new manhole. Above the gib the ceiling has a rough textured coating, and the soffit linings cut back under the eaves look fibrous. The client's project manager says the house was 'tested years ago' but no report can be found. It is week 3 of a 12-week programme, with an 18-year-old apprentice on site and four other trades working in the adjoining rooms. The client wants the hallway closed in by Friday so the electrician can run cable. One worker says the texture is 'just plaster' and has already run a power sander over a test patch. The company holds no asbestos removal licence, there is no exclusion zone or signage, and the hallway doors are open to the rest of the house.
1. What must happen before any further work in the hallway, and who is legally able to remove the material?
Read the worked answer
Stop work and presume the material is asbestos until an analysis says otherwise.
As a PCBU, the company has a duty under the Health and Safety at Work Act 2015 to manage risks, and the Asbestos Regulations 2016 require asbestos (or presumed asbestos) in a workplace to be identified before work that may disturb it. Asbestos-containing materials were used in NZ well into the 1980s; textured ceiling coatings, fibre-cement soffit sheet and vinyl flooring adhesive in a 1978 house are all plausible candidates. A verbal 'it was tested' is worth nothing without the report - presume contamination.
Sequence:
- Clear the hallway and adjoining rooms, stop every trade, tape and sign the entry, and shut the doors. The sanding has already spread dust through an open house.
- Have samples taken by a trained person and analysed by an IANZ-accredited laboratory (bulk identification), or simply presume and move to removal.
- Treat the sanding as an exposure incident: record names, times, PPE worn and areas entered. Exposure to a substance harmful to health is a notifiable incident, so notify WorkSafe.
- Engage a licensed removalist. Sanded textured coating is friable and needs a Class A removal licence. Even non-friable material under 10 m² can only be removed licence-free if the workers are trained and the regulations' controls, PPE and waste rules are met - this job does not sit inside a tidy-up exemption.
- Record everything: survey report, clearance certificate, waste disposal dockets, and an updated asbestos register for the site.
2. The client insists the hallway is closed in by Friday. How would you respond, and what controls would apply if removal proceeded?
Read the worked answer
Respond in writing, not verbally, and separate the safety decision from the programme decision.
Explain to the client that the hallway cannot be lined over: the electrician needs to cut into that ceiling to run cable, so the material has to come out, not be sealed in. Friday is not achievable and no amount of pressure changes the legal position. Put the delay notice in writing the same day, with the reason, the likely duration, and who bears the cost (check the contract - if the asbestos was not disclosed, the delay and removal are usually a variation).
If removal proceeds, the controls follow the hierarchy: eliminate the hazard by removing the material, then minimise exposure, with PPE last.
- Enclose the hallway with taped poly and run a HEPA negative-air unit; post 'Asbestos removal in progress - no entry' signage and restrict access to trained, authorised people.
- Keep the material wet; hand tools only; no power sanding or cutting.
- Wear fit-tested P2/P3 half-face respirators with a clean-shaven seal, disposable coveralls, gloves and boot covers, with a proper donning and doffing sequence at a decontamination station.
- Double-bag waste in labelled 200 micron bags and send it to an approved disposal facility, keeping the dockets.
- Obtain a clearance inspection or certificate before the area is reoccupied, and only then reinstate linings.
- Brief the other trades and the client so nobody wanders into the zone, and re-sequence the programme around the removal.
3. The apprentice asks why a P2 mask is not enough to make the power sanding safe. Explain your reasoning.
Read the worked answer
A mask only protects the person wearing it - and only if it is fitted, clean and used correctly. It does nothing about what the sanding has already put into the air.
Reasoning to give the apprentice:
- RPE is the lowest control on the hierarchy. It is the last thing you rely on, not the first. The higher controls - not creating dust at all, wetting the material, containing the area - are what actually reduce risk.
- Power sanding generates a high concentration of airborne fibres. A P2 mask has an assigned protection factor; at high concentrations it can be overwhelmed, and the fibres that escape the mask drift through the rest of the house where other trades are working and where the client's family may later live.
- Fit matters. An 18-year-old who has never been fit-tested, with any facial hair or a poor seal, is effectively unprotected. It was also not worn at the moment the patch was sanded.
- Clean-up after the sanding is the hard part: dust settles on every surface, in the carpet, on tools and clothing. That contamination follows people out to their cars and homes.
- The law also expects the risk to be managed by the PCBU, not by handing out masks. The correct answer here was to stop, identify and get a licensed removalist - not to sand faster with a mask on. Finish by telling the apprentice plainly: it was not his fault, but he must stop and ask before touching anything he suspects is asbestos.