Asbestos in the roof space: what is above your ceiling
The insulation itself is the least likely thing up there to contain asbestos. The roof space is still the one part of a house where the usual reassurance does not apply.
If you are searching for asbestos roof insulation, the useful first answer is that the insulation is usually not the asbestos question. Ordinary bulk insulation (the batts, rolls and blankets laid between the ceiling joists) is glass wool, rock wool or polyester. Those are irritating to handle and nothing to be casual about, but they are not asbestos products.
What can contain asbestos in an Australian roof space is a different list: loose-fill insulation, lagging on flues, pipes and old heaters, the underside of cement roof sheeting and eaves lining. And the offcuts, broken board and dust that decades of tradespeople have left sitting on top of the ceiling.
None of that is a confirmation, and this page is deliberately not one. No one can identify asbestos by looking at it, from a manhole or from a photograph: only laboratory analysis settles what a material is. And accreditation by NATA is what gives you grounds to rely on the result. What the checks below do is tell you whether the question is live enough to settle before anyone goes up there.
Why the roof space is not like the rest of the house
Most asbestos left on Australian houses is bonded cement sheet, and the standard reassurance about it is true: intact, painted and left alone, it is a manageable problem. The roof space changes that arithmetic in three ways at once.
First, it is where the friable products are. Loose-fill insulation and damaged pipe lagging crumble under hand pressure, which is the distinction regulators actually use. And it decides who may touch the material and what the job becomes. Second, it is unventilated: fibre disturbed in a sealed cavity settles back onto every surface in it rather than blowing away.
Third, and least obvious, it is connected to the rooms below. Through the manhole, downlight cut-outs, exhaust fans, ducted air returns, and the gap behind the cornice. Anything stirred up in a roof space has a path into the house.
The four things people mean by “roof insulation”
| What it is | What it looks like | Asbestos question |
|---|---|---|
| Bulk insulation batts and blanket | Slabs or rolls cut to fit between the joists, pale yellow, pink, white or grey, springy, often with a paper or foil facing. Itchy to touch. | Not an asbestos product. This is the most common thing in a roof space and the most common false alarm. |
| Loose-fill insulation | Loose fibrous or granular material poured or pumped between the joists, with no backing, no facing and no shape of its own. It drifts and settles into corners. | Live, and the serious case. Loose-fill amosite was installed in Canberra homes and in parts of southern New South Wales. Check the register before you look, not after. |
| Lagging on flues, pipes and heaters | A white or grey plaster-like wrap, sometimes corded or bandaged, around flue pipes, old hot water pipes, chimney penetrations and the backing behind old heaters. | Live. Friable once it is damaged, and it damages easily with age. |
| Sheeting, offcuts and debris | Rigid grey board: the back of the eaves lining, the underside of cement roof sheeting, plus broken pieces, offcuts and dust left on the ceiling by past work. | Live. Bonded while intact, but broken and powdered board on a ceiling is no longer intact. |
One more thing that causes confusion: the shiny silver reflective foil sarking stapled under the rafters is an aluminium foil laminate, not an asbestos product. What it is fixed to is a separate question.
Three checks before anyone opens the manhole
1. The registers, if they apply. Loose-fill is the one Australian asbestos situation where the first step is a list rather than a look, because looking is the part that can hurt you. If the house is in the ACT or in an affected New South Wales local government area, check the loose-fill register first.
2. The age of the materials, not the house. Asbestos was taken out of Australian cement sheeting through the 1980s. And the total ban on manufacturing, importing and using asbestos products took effect on 31 December 2003. A roof space can be older than it looks from outside: replacing a roof changes the sheets. And changes nothing about what is lying on top of the ceiling.
3. What has already been done up there. Ducted air conditioning, rewiring, downlights, a previous insulation top-up, a solar installation. Each one means somebody has moved through the space. And possibly broken and shifted material while doing it. The previous owner, the agent and whatever paperwork came with the house are all worth asking.
Adding insulation, downlights or ducting? Settle it first
The asbestos question in a roof space is almost never raised by curiosity. It is raised by a job: topping up insulation, putting in downlights, running cable, installing ducted air, cutting in a vent. All of those involve someone working on their knees among whatever is up there, and most of them involve cutting through the ceiling as well.
The order matters more than anything else on this page. An assessment before the work is a question about a roof space. The same assessment after the work is a question about a contaminated house. And that is a different job with a different licence and a different set of consequences. Covering old material with new insulation settles nothing: the installer still works in the space, and the material is still there afterwards.
What not to do up there
This is a list of negatives on purpose: handling, cleaning and removal methods are licensed work, and are not described here.
- Do not sweep, brush, rake or blow anything in a roof space.
- Do not use a household or workshop vacuum. Ordinary vacuum cleaners pass fine fibre through the filter and the motor and put it back into the air.
- Do not use the space for storage, and do not walk through it to reach a water tank, an aerial or an air conditioning unit while the question is open.
- Do not take a sample of loose or crumbling material yourself. Sampling has its own rules, and friable material is not a homeowner sampling job under any of them.
- Do not accept an identification made from a photograph, or a verdict from a trade who put their head through the manhole and had a look.
Where the line is
Loose-fill and damaged lagging are friable, and friable asbestos removal is Class A licensed work across Australia. There is no homeowner allowance for it of the kind that exists in some jurisdictions for small areas of bonded sheeting. And those bonded thresholds are set separately by each state and territory. So a figure quoted for one cannot be assumed to apply in another. Your own WHS regulator is the only place to confirm what applies where the house is.
That leaves two honest exits. Presume the material is asbestos, leave it alone, and tell anyone who needs to work up there before they go: which costs nothing while it stays undisturbed. Or have a licensed assessor inspect the space and have samples analysed by a NATA-accredited laboratory, which is what you need if work is planned. Going up with a torch to decide for yourself is not one of the options.
Frequently asked questions
Is the insulation in my roof asbestos?
Bulk insulation batts, rolls and blanket are glass wool, rock wool or polyester, and are not asbestos products. The asbestos question in a roof space is about loose-fill insulation, lagging on flues and pipes, cement sheeting and old debris left on the ceiling, rather than about the batts.
What is loose-fill asbestos insulation?
It is loose fibrous material pumped between ceiling joists as insulation, with no backing or facing, and it is friable. It was installed in Canberra homes and in parts of southern New South Wales, and the government registers of affected properties are the first thing to check. Before opening the manhole, not after.
Can I lay new insulation over the old insulation?
Not while the question is open. Covering material does not make it safe, the installer still has to work in the space to do it, and whatever is underneath is still there afterwards. An assessment before the work is a question about a roof space; the same assessment after the work is a contaminated house.
Is the silver foil under my roof asbestos?
Reflective foil sarking is an aluminium foil laminate and is not an asbestos product. The sheeting it is fixed under, and anything lying on the ceiling below it, are separate questions.
Can I vacuum dust out of my roof space?
No. A household or workshop vacuum passes fine fibre through the filter and the motor and puts it straight back into the air, and roof space dust is one of the places where broken cement sheeting ends up. Cleaning a roof space that may contain asbestos is licensed work.
Who is allowed to remove asbestos from a roof space?
Friable material such as loose-fill or damaged lagging is Class A licensed work everywhere in Australia, with no homeowner allowance. Thresholds for small areas of bonded sheeting are set by each state and territory and differ between them, so check with the WHS regulator for the state the house is in.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- NSW Government. Loose-fill asbestos insulation (Mr Fluffy). Affected areas and the register
- NSW Government. Asbestos in NSW. The NSW Government asbestos portal
- Asbestos Safety and Eradication Agency. Asbestos Product Guide. What products contained asbestos and where they were used