Fibre cement or asbestos cement roof sheets: how to tell
Updated 23 October 2026 · SEO Dons Editorial
Start with when the roof was laid, not what it looks like. Asbestos cement and the fibre cement sold today are both hard grey cement sheets, and colour and profile do not settle which one is overhead. This guide sets out the clues that carry weight, how a result is confirmed and by whom, and what to do next in each case.
Can you tell by looking at the roof sheets?
Not reliably. HSE describes asbestos cement as ordinary cement mixed with asbestos, a hard, grey material, and lists large profiled roof sheeting among its uses. Modern fibre cement roofing is also a profiled grey cement sheet. HSE's own FAQ says it can be difficult to identify asbestos, as it is often mixed with other materials.
Weathering does not help either: HSE's list of lower-risk tasks includes cleaning weathered asbestos cement roofing, so a mossy or faded sheet can still be asbestos cement.
| Clue | What it can tell you | How far to trust it |
|---|---|---|
| Date the roof was laid | HSE says asbestos may be present in buildings built or refurbished before 2000 and is unlikely after | Strongest clue, but it applies to the roof, not the building |
| Records and plans | The law expects the age of the premises and building plans to be taken into account | Strong if the paperwork names the roof |
| Markings on the sheet | BSI says BS EN 494 covers marking and labelling of fibre-cement sheets | Supports a view; a missing or worn mark proves nothing |
| Profile, colour, weathering | Both products are grey cement sheets | Weak |
What does the installation date tell you?
HSE says asbestos was banned in 1999, which made using it in building construction or refurbishment illegal. The Asbestos (Prohibitions) (Amendment) Regulations 1999 came into force on 24 November 1999 and, as made, barred the use of asbestos cement unless it was already installed in the same premises before that date. HSE adds that asbestos can be present in any building built or refurbished before 2000, and that buildings constructed after 2000 are unlikely to contain it.
So a roof laid in the 2000s, with paperwork to prove it, is unlikely to be asbestos cement, while a roof on a unit built in the 1980s should be presumed to be. The grey area is the mixed roof: an extension, a re-sheeted bay, a section replaced after storm damage. The date that matters is when that area of roof was laid. The standards also treat the products separately: BS EN 494 specifies fibre-cement profiled sheets, and BS 8219, the installation code for profiled fibre cement, states that it makes no reference to asbestos cement.
How is the material confirmed, and what does the law require?
HSE is plain that the only way to confirm whether a suspect material contains asbestos fibres is to obtain and analyse a sample of it. It adds that sampling should be carried out by a suitably trained person, with a competent surveyor the route if in doubt, and that the analysts must be trained, competent and accredited. HSE strongly recommends accredited surveying organisations and names UKAS as the sole recognised accreditation body in Great Britain for asbestos inspection bodies carrying out surveys.
For a roof owner that has two practical consequences:
- Do not scrape, drill or break a sheet to find out. HSE lists aggressive physical disturbance of asbestos cement, such as breaking or smashing, among the activities that can create a significant concentration of fibres in the air.
- Expect a survey, not just a test. A survey records where the material is, how much there is and what condition it is in, and a management survey covers external areas including roofs, soffits and gutters.
Regulation 4 of the Control of Asbestos Regulations 2012 puts the duty to manage on whoever has an obligation, by contract or tenancy, for the maintenance or repair of non-domestic premises. That dutyholder must make a suitable and sufficient assessment of whether asbestos is or is liable to be present, taking account of building plans or other relevant information and of the age of the premises. HSE's summary adds the working rule: presume materials contain asbestos unless there is strong evidence that they do not.
The same logic binds the contractor. Under regulation 5, an employer must not undertake maintenance work that could expose its employees to asbestos unless it has carried out an assessment or, if there is doubt, assumes that asbestos is present.
What to do next in each case
| Situation | What the sources say | Next step |
|---|---|---|
| Roof laid after 2000 and the date is documented | HSE: buildings constructed after 2000 are unlikely to contain asbestos | Keep the paperwork with the building records, and still treat the roof as fragile |
| Built or refurbished before 2000, or date unknown | HSE: asbestos can be present; presume it is unless there is strong evidence otherwise | Record it as presumed asbestos, arrange a survey by a competent surveyor before any work, and tell anyone who might disturb it |
| Part of the roof newer than the rest | The date applies to the sheets, not the building | Ask the surveyor to assess each roof area on its own evidence |
| Sheets cracked, broken or storm-damaged | HSE: where asbestos cement is badly damaged, a risk assessment decides whether a licensed contractor is needed | Stop, keep people away and take advice from a competent asbestos surveyor or contractor |
If analysis confirms asbestos cement, the routes are managing it in place, encapsulating it, overcladding it or removing it, and the asbestos cement roof guide compares them. HSE says most work on asbestos cement can be done without a licence if workers have had appropriate information, instruction and training, but dropping an asbestos cement roof calls for notification of non-licensed work. Which category applies is for a competent contractor's risk assessment, not something to judge from the ground.
Why are both types treated as fragile?
HSE's rule is that all roofs, once fixed, should be treated as fragile until a competent person has confirmed that they are non-fragile. It names non-reinforced fibre-cement sheets, irrespective of profile type, among the materials likely to be fragile, and says falls through fragile surfaces, particularly fibre-cement roofs and rooflights, account for 22% of fall-from-height fatal injuries in the construction industry.
So the answer to whether you can walk on fibre cement roof sheets is no, whichever type they are. Regulation 9 of the Work at Height Regulations 2005 requires employers to ensure that no one passes across or near a fragile surface where the work can reasonably be done without doing so, so a leak check or survey is planned around platforms, covers or access from below. The fragile roofs and rooflights guide covers the owner's side of those duties.
How does the answer change a refurbishment?
Whether the sheets are asbestos cement shapes the route and the order of work, which is why the question belongs at the start of an industrial roof refurbishment. HSE notes a legal requirement for all asbestos-containing materials to be removed, as far as reasonably practicable, before major refurbishment or demolition. The sheets are rarely the only item: HSE says asbestos cement downpipes and gutters are often attached at the end of cement roofs in warehouse-type buildings, so the gutter lining guide is worth reading too.
If you want contractors to price a roof once the survey result is known, you can send an enquiry through the site's form.
Sources
- HSE, locations of asbestos, introduction to asbestos safety and FAQs (HSE, checked 22 October 2026)
- HSE, arrange an asbestos survey and the duty to manage (HSE, checked 22 October 2026)
- HSE, fragile surfaces (HSE, checked 22 October 2026)
- Control of Asbestos Regulations 2012, regulation 4 and regulation 5; Asbestos (Prohibitions) (Amendment) Regulations 1999; Work at Height Regulations 2005, regulation 9 (legislation.gov.uk, checked 22 October 2026)
- BSI Knowledge, BS EN 494 and BS 8219 (BSI, checked 22 October 2026)
Common questions
Is an asbestos cement roof dangerous if it is left alone?
HSE says that when asbestos is in good condition and not disturbed the risk of exposure is extremely low. The danger comes from damage and disturbance, which is why an intact roof is recorded and monitored under the duty to manage.
Why shouldn't I break off a piece and send it to a laboratory?
HSE says analysis of a sample is the only way to confirm the material, but also that sampling should be carried out by a suitably trained person, using a competent surveyor if in doubt. Breaking or smashing asbestos cement is on HSE's list of activities that can release significant fibres, so the sampling step belongs to someone trained and equipped for it.
Are asbestos cement gutters and flues part of the same question?
Yes. HSE lists cement downpipes and gutters, often attached at the end of cement roofs in warehouse-type buildings, and cement flues among asbestos cement products. A survey of the roof should cover them too, and a gutter job needs the same presumption until the result is known.
Does the 1999 ban mean every newer roof is clear?
It makes asbestos cement unlikely on a roof laid after that date, but it is a strong clue rather than proof, because extensions, patched bays and undocumented repairs can have a different date from the main roof. Keep records that show when each area was laid, and treat every sheeted roof as fragile regardless.