If your home was built or renovated before the late 1980s, there's a genuine chance asbestos is somewhere in the roof. It was cheap, fire-resistant and easy to work with, so builders used it everywhere across Sydney and regional NSW for decades. The trouble is nobody knew back then how dangerous the fibres were once they got into the air.
The good news is that asbestos sitting quietly on a roof, undisturbed and in reasonable condition, is generally low risk. The danger comes when it's cut, drilled, broken, sanded or left to weather and crumble. This guide walks you through what asbestos roofing looks like, how to tell if you've got it, and the honest, safe options for dealing with it. We're not here to scare you into anything — just to give you the facts so you can make a sensible decision.
Where asbestos turns up in a roof
Most people picture the classic corrugated 'fibro' roofing, and that's the big one, but asbestos hid in more places than you'd expect. On a lot of older Sydney homes it shows up in the roof and the bits around it, so it pays to know the usual suspects before you assume you're in the clear.
- Corrugated asbestos-cement roof sheeting (the grey 'super six' profile is a common one)
- Flat asbestos-cement sheets used under tiles or as sarking
- Ridge capping and flashings made from moulded cement products
- Eaves lining and soffit boards under the roof overhang
- Old gutters and downpipes made from asbestos cement
- Insulation debris or loose fibres sitting in the roof cavity from past work
Two types matter here. Bonded (or non-friable) asbestos is the hard, cement-based material where the fibres are locked into a solid sheet — that's what most roofing is. Friable asbestos is the soft, crumbly stuff that releases fibres easily; it's far more dangerous and much rarer in roofing, but weathered, cracked or hail-damaged sheets can start heading that way as they break down.
How to tell if your roof has asbestos
You cannot identify asbestos reliably just by looking at it. Cement roofing that contains asbestos looks almost identical to modern fibre-cement products that don't. The only certain way to know is a laboratory test on a properly collected sample. That said, age is your best first clue: if the roof or an extension went on before 1990, treat it as suspect until proven otherwise.
If you want certainty, a licensed asbestos assessor can take a sample and have it analysed by an accredited lab. Never break off a chunk yourself to 'have a look' — that's exactly the sort of disturbance that puts fibres in the air. If you're planning any roof work at all on an older home, getting this checked first is the smart move, because it changes how the whole job has to be handled.
Why you should never DIY asbestos roofing
It's tempting to grab the angle grinder and rip off a few dodgy sheets on a Saturday. Please don't. Cutting, drilling, water-blasting or even walking heavily on asbestos sheeting releases microscopic fibres that you can't see and can't feel. Breathed in, they can cause asbestosis, lung cancer and mesothelioma — often decades later. There is no safe level of exposure, which is why the whole trade treats it so seriously.
In NSW there are also strict legal rules. Removing more than 10 square metres of bonded asbestos requires a licensed removalist, and any friable asbestos removal requires a specific friable licence regardless of quantity. Waste has to go to a licensed facility with the right paperwork — you can't put it in the household bin or take it to a normal tip. Getting this wrong risks heavy penalties as well as your health and your family's.
Repair, encapsulate, or replace?
If your asbestos roof is in decent nick, sometimes the safest thing is to leave it alone and simply monitor it. Where there's minor damage, a licensed professional can sometimes seal or encapsulate the surface to lock the fibres in and buy you time. But encapsulation is a holding measure, not a cure — the material is still up there and will keep ageing.
For most homeowners, full removal and replacement is the long-term answer, especially if the roof is leaking, badly weathered or you're renovating anyway. Modern Colorbond steel or tile roofing is lighter, safer and comes with proper warranties. When we quote a replacement on an older Sydney home, we factor in the extra care asbestos demands — controlled removal, proper wetting-down, sealed disposal and clearance — so there are no nasty surprises on the day.
What safe removal actually involves
- A licensed removalist and a written safe-work plan before anything starts
- Wetting the material down to suppress dust rather than cutting it dry
- Removing sheets whole where possible instead of breaking them up
- Sealed, labelled wrapping and transport to a licensed disposal site
- A thorough clean-up of the roof cavity, gutters and surrounding ground
- Clearance and documentation so you have proof it was done properly
Done right, an asbestos roof replacement is a controlled, methodical job — not a demolition free-for-all. It costs a bit more than a standard reroof because of the handling and disposal, but you end up with a safe, modern roof and complete peace of mind.
Talk to us before you touch it
If you suspect asbestos in your roof, the best first step is a free, no-obligation inspection. We'll take a careful look, tell you honestly what we think you're dealing with, and lay out your realistic options — whether that's monitoring, arranging testing, or planning a full replacement. No pressure, no scare tactics. Give the team a call on 0416 689 689 and we'll help you sort it the right way.