Asbestos-containing material

Frequently asked questions

What does friable mean, and why does it decide so much?

It means the material can be crumbled, pulverised or reduced to powder by hand pressure when dry — and it decides almost everything because it predicts whether ordinary disturbance releases fibres. Sprayed coatings, pipe lagging and insulating board are friable: the fibres are loosely bound, so cutting, drilling or simply knocking them puts fibres into the air. Asbestos cement sheet, vinyl floor tiles and bitumen products are non-friable: the fibres are locked into a hard matrix, and the material is comparatively low-risk intact. The distinction is about the BINDING, not the percentage — a cement sheet containing more asbestos by weight than an insulating board can be the safer material to have in a building. It also explains the trap: a non-friable material becomes friable the moment somebody takes an angle grinder or a power saw to it, which is why the prohibition on power tools appears in every set of rules regardless of category.

Why is a survey before work a different thing from the one on file?

Because they answer different questions, and using the wrong one is a routine and serious error. A MANAGEMENT survey locates the material a building's occupants could disturb in normal use, and deliberately does not open up the structure — it is the basis of the register that tells a maintenance engineer what not to drill into. A REFURBISHMENT AND DEMOLITION survey is intrusive: it goes into ceiling voids, behind linings, under floors and into ducts, precisely because that is where the work is about to go. A management survey is therefore silent about exactly the places refurbishment reaches, and its silence is not a finding of absence. Starting a strip-out on a management survey is one of the most common ways a job discovers asbestos with the tools already running, which is the worst possible moment: work stops, the area becomes a potential contamination incident, and the cost of that dwarfs the survey.

Is leaving it alone really safer than removing it?

Often yes, and that is genuinely counterintuitive. Intact, undamaged, non-friable material in a place nobody disturbs releases essentially nothing; removing it is a disturbance by definition, and every removal creates an episode of elevated fibre release that has to be controlled with enclosures, negative pressure and clearance testing. So the default duty in British law is to MANAGE rather than to remove: record where it is, assess its condition, label it, tell anyone who might work near it, and inspect it periodically. Removal becomes the right answer when the material is damaged, is deteriorating, is somewhere it will inevitably be disturbed, or is in the way of the work. The practical implication for anyone estimating a refurbishment is that the asbestos line item is not a fixed property of the building — it depends on which materials the design actually reaches, which makes it one of the few costs that a design change can remove entirely.