Asbestos roof in NZ: Super Six sheets, painting, and what removal costs

How do you know if a roof is asbestos?

Start with what it looks like and how old it is. Asbestos-cement roofing is grey cement sheet in wide, deep corrugations, often weathered to a rough, lichen-spotted surface and sometimes painted. It was common on houses, garages, sheds, farm buildings and factories. WorkSafe's residential list names roofing panels such as 'Super Six', and its commercial list adds Super Six and Super Eight roof sheeting and awnings, fluted ridge capping, roof ventilators, barge moulding, gutters, rainwater heads and downpipes.

Profile and age only make it likely. Modern fibre-cement roofing exists too, and an old roof may have been patched with newer sheets. A surveyor takes a small sample from an edge, seals the spot, and an accredited laboratory gives the answer. Climbing up and breaking a piece off yourself is the wrong way round on both counts.

Is an asbestos roof dangerous?

An intact roof that is left alone is generally managed in place, as WorkSafe advises for undamaged non-friable asbestos. The risks come from what people do to it: cutting or drilling through sheets to fit vents or solar brackets, breaking sheets while walking on them, scrubbing or blasting off moss, and clearing out gutters full of weathered debris. Old roofs also get more brittle with age, so a cracked or broken sheet deserves attention sooner.

Can you water-blast or paint an asbestos roof?

Water-blasting, no. Regulation 18 of the asbestos regulations says a PCBU — any business, including a roofer, painter or house-washer — must not use high-pressure water spray on asbestos or asbestos-containing material, defined as water pressurised by positive-displacement pumps above 350 kPa. Compressed air is banned the same way, and power tools and brooms may only be used with controls. A quote to water-blast a Super Six roof before painting is a quote to break the rules.

Painting is a different question. Paint applied to intact sheet, without abrasive preparation, isn't the disturbance; the preparation is where the risk sits. If you're having an old cement roof painted, find out what it is first, then make sure the preparation method suits asbestos cement.

Who is allowed to remove an asbestos roof?

A licensed remover, in almost every case. More than 10 m² of non-friable asbestos, counted across the whole job, needs a Class B or Class A licence (reg 56), and even a garage roof is usually larger than that. The remover must notify WorkSafe in writing at least 5 days before work starts (reg 34), and the area needs an independent clearance inspection and certificate before it is reoccupied (regs 41–42). The rules page has each threshold with its regulation number.

A homeowner-occupier working on their own home isn't bound by the regulations in the same way, but WorkSafe advises against doing it yourself, and the fragile-roof hazard alone is a good reason. See can I remove asbestos myself?.

How much does asbestos roof removal cost in NZ?

The only New Zealand dataset we could source, CheckMyBuilder's asbestos removal cost page (updated June 2026), puts removing a full asbestos-cement roof in its mid-range tier of $4,000–15,000, with overall rates of $30–150 per m². On top of that it lists disposal and cartage at $500–3,000. Those figures cover taking the old roof off and away. They don't include the new roof, which is priced by your roofer separately.

Size, pitch, access, height, and whether the gutters and downpipes come off too all move the price. A quote should list the WorkSafe notification, the removal method, disposal with dockets, and the independent clearance as separate lines. See asbestos removal cost for the full breakdown and where asbestos can be disposed of for per-tonne charges.

What should you do next?

1. Don't let anyone water-blast, scrub or walk on the roof until you know what it is.
2. Get one sample tested: a $249 test covers a visit and one sample. The gutters and ridge capping can be extra samples at $85 each.
3. If it's positive and you're replacing the roof, ask for a fixed removal quote, naming the licensed remover and their licence class.