Asbestos in soil is a different specialism from asbestos in buildings. It arrives through demolition rubble used as fill, through buried waste from before disposal was controlled, and through weathered material from a roof or a shed washing into the ground beneath it. It is assessed by contaminated land specialists rather than by a building surveyor, and the analysis and the risk assessment both work differently.
How it gets there
Demolition arisings used as hardcore under drives, floors and gardens. Buried asbestos cement and insulation from decades when tipping was unregulated. Weathered fragments beneath an old asbestos cement roof or a shed with no guttering. And made ground on former industrial sites, which is why development land is investigated before it is built on.
Who assesses it
A contaminated land or geoenvironmental consultant, using soil sampling on a grid or targeted pattern, with laboratory analysis for both visible fragments and the fibre content of the fine fraction. The two questions are different: a piece of cement sheet in the ground and respirable fibres in the soil are different risks and are managed differently.
On a development site
Ground investigation for a planning application or a development normally covers asbestos as one determinand among many. Where it is found, the remediation strategy is agreed with the local authority and the regulator, and it may involve removal, capping or a combination. That is a site process rather than a homeowner one.
Fragments in a garden
If cement fragments are turning up in a garden, do not break them up, do not put them in a household bin, and do not power wash the area. Collect the question rather than the fragments: a specialist can advise whether the ground needs testing or whether removing the visible pieces is enough. Where it came from matters too, because a shedding roof above will keep supplying more.
Questions people ask about asbestos in soil
Is asbestos in soil dangerous?
Bound fragments in the ground are a low release risk while undisturbed. Digging, rotavating and dry weather dust are what change that, which is why the assessment looks at how the land is used.
Who removes contaminated soil?
Specialist remediation contractors under an agreed strategy, with the arisings consigned as hazardous waste. It is a groundworks job with asbestos controls rather than a building strip out.
Do I have to declare it when selling?
Known contamination is normally disclosed in the standard enquiries, and a buyer's solicitor will ask. Having the investigation and any remediation record to hand is the straightforward answer.