Asbestos is not a single material. It is a group of naturally occurring silicate minerals, all of which share the same fibrous structure that made them so attractive to builders and manufacturers throughout the twentieth century. Six types of asbestos exist, but three were used extensively in UK construction: chrysotile (white), amosite (brown), and crocidolite (blue).
Understanding which type of asbestos is present in a building matters because the three types differ in their fibre dimensions, their durability in the body, and therefore their relative health risk. All three are hazardous and all three are banned in the UK. But the risk profile of each is distinct, and that distinction influences how a surveyor assesses the urgency of removal.
The Three Main Types of Asbestos
| Type | Mineral Name | Colour | Fibre Type | Relative Risk |
|---|---|---|---|---|
| White asbestos | Chrysotile | White/grey | Serpentine (curly) | High |
| Brown asbestos | Amosite | Brown/grey | Amphibole (straight) | Very High |
| Blue asbestos | Crocidolite | Blue/grey | Amphibole (straight) | Highest |
The colour descriptions refer to the raw mineral, not the finished product. In a building, all three types are typically bound within a matrix material — cement, vinyl, or insulation board — and are not visually distinguishable without laboratory analysis. Do not attempt to identify asbestos type by colour alone.
White Asbestos — Chrysotile
Chrysotile accounts for approximately 95% of all asbestos ever used worldwide, and it was by far the most common type used in UK construction. Its fibres are curly and flexible — a serpentine structure that distinguishes it from the two amphibole types. This structure means chrysotile fibres are more easily cleared by the body's natural defence mechanisms, but that does not make them safe. Prolonged or high-level exposure to chrysotile causes mesothelioma, lung cancer, and asbestosis.
In UK homes, chrysotile is most commonly found in asbestos cement products — garage roofs, shed cladding, guttering, downpipes, and flue pipes. It was also used extensively in floor tiles, textured coatings such as Artex, and in the insulation of domestic appliances including storage heaters and boilers.
Where chrysotile is typically found in UK homes
Garage roofs and shed cladding (asbestos cement sheets), textured ceiling coatings (Artex applied before 2000), floor tiles and their adhesive, guttering and downpipes, boiler flue pipes, and the insulation panels of storage heaters.
Brown Asbestos — Amosite
Amosite — the name derives from the acronym AMOSA, standing for Asbestos Mines of South Africa — is an amphibole asbestos with straight, brittle fibres. These fibres are more resistant to the body's clearance mechanisms than chrysotile, and they persist in lung tissue for longer. Amosite is associated with a higher risk of mesothelioma per fibre than chrysotile.
In UK buildings, amosite was used primarily as a spray-applied fire protection coating on structural steelwork, and in insulation boards — particularly Asbestolux and Marinite boards used in ceiling tiles, partition walls, and fire doors. It was also used in pipe lagging and thermal insulation in commercial and industrial buildings. In domestic properties, amosite is most likely to be encountered in ceiling tiles, partition boards, and the insulation of heating systems.
Where amosite is typically found in UK buildings
Ceiling tiles and suspended ceiling systems, insulation boards (Asbestolux, Marinite), fire doors and partition walls, pipe lagging in heating systems, and spray-applied fire protection on structural steelwork in commercial buildings.
Blue Asbestos — Crocidolite
Crocidolite is the most hazardous of the three main types. Its fibres are extremely fine, straight, and needle-like — characteristics that allow them to penetrate deep into lung tissue and remain there for decades. Crocidolite has the strongest association with mesothelioma of any asbestos type, and even relatively brief exposure carries a significant risk.
The use of crocidolite in UK construction was more limited than chrysotile or amosite, partly because its hazardous properties were recognised earlier. It was banned in the UK in 1985 — fourteen years before the full asbestos ban. In buildings, crocidolite was used in spray insulation, pipe lagging, and some insulation boards. It is less likely to be found in domestic properties than in commercial and industrial buildings constructed before 1985.
Highest-risk material — immediate professional assessment required
If crocidolite is identified in a survey, it should be treated as a priority for removal. Do not disturb the material under any circumstances. Contact a licensed asbestos removal contractor immediately.
Where Is Asbestos Found in UK Homes?
Any property built or substantially renovated before 2000 may contain asbestos. The material was used in so many different construction products that it can appear in almost any part of a building. The following locations are the most common in domestic properties across the UK.
Garage Roofs & Sheds
Corrugated asbestos cement sheets were the standard roofing material for garages, sheds, and outbuildings from the 1950s through to the 1990s. This is the most common ACM found in domestic properties across Surrey and the South East.
Textured Coatings (Artex)
Artex and similar textured ceiling and wall coatings applied before 2000 frequently contain chrysotile asbestos. The material is only hazardous when sanded, drilled, or otherwise disturbed — leaving it intact and in good condition is often the safest option.
Floor Tiles & Adhesive
Vinyl floor tiles manufactured before 2000 may contain asbestos, as may the black bitumen adhesive used to fix them. The tiles themselves are generally low risk when intact, but the adhesive can be friable and should be assessed before any floor renovation work.
Ceiling Tiles
Suspended ceiling tiles in pre-2000 properties — particularly in kitchens, bathrooms, and commercial spaces — may contain amosite or chrysotile. These tiles are often brittle and can release fibres if damaged.
Boiler Flue Pipes
Asbestos cement flue pipes were used extensively with gas and solid-fuel boilers installed before the 1990s. These pipes are often found in utility rooms, kitchens, and roof spaces. Removal requires care as the material can be friable.
Pipe Lagging & Insulation
Thermal insulation on hot water pipes and heating systems in pre-1980 properties may contain amosite or crocidolite. This is one of the highest-risk forms of domestic asbestos as the material is often friable and in poor condition.
Partition Walls & Boards
Insulation boards used in partition walls, fire doors, and ceiling panels — particularly Asbestolux and Marinite — contain amosite. These boards are common in commercial buildings and in some domestic extensions built before 1980.
Roof Felt & Guttering
Some roofing felt and guttering products manufactured before 2000 contain chrysotile. This is less common than asbestos cement but should be assessed during any roof replacement or guttering work.
How to Identify Asbestos
Asbestos cannot be identified by sight alone. The only reliable method of identification is laboratory analysis of a sample taken from the suspect material. Polarised light microscopy (PLM) is the standard analytical technique used by UKAS-accredited laboratories, and it can identify the type and concentration of asbestos fibres in a sample.
Visual clues can help you decide whether to commission testing. Corrugated cement sheets on a garage or shed roof built before 2000 are highly likely to contain asbestos. Textured ceiling coatings in a pre-2000 property should be assumed to contain asbestos until tested. Any pipe lagging or insulation board in a pre-1980 building should be treated as suspect.
Do not take samples yourself
Taking samples from suspect materials without proper training and equipment risks releasing asbestos fibres into the air. A qualified surveyor will take samples safely, using appropriate PPE and containment procedures, and will send them to a UKAS-accredited laboratory for analysis.
What to Do If You Suspect Asbestos
The correct response to suspected asbestos depends on the condition of the material and whether any work is planned that might disturb it.
Leave it undisturbed
If the suspect material is in good condition and is not going to be disturbed, the safest immediate action is to leave it alone. Asbestos in good condition that is not disturbed does not release fibres.
Do not sand, drill, or cut
Never sand, drill, cut, or otherwise disturb a material you suspect may contain asbestos. These actions release fibres into the air. This applies to Artex ceilings, cement sheets, floor tiles, and any other suspect material.
Commission an asbestos survey
Contact a qualified surveyor to carry out a management or refurbishment survey. The survey will confirm whether asbestos is present, identify the type, and assess the condition and risk level.
Follow the survey recommendations
If the survey recommends removal, commission a licensed asbestos removal contractor. If the survey recommends management in place, follow the management plan and arrange re-inspection at the recommended interval.
Keep the survey report
Retain the survey report and any disposal certificates. These documents will be required if you sell the property, carry out future renovation work, or need to demonstrate compliance with your legal obligations.