How to handle asbestos safely: the hierarchy of controls for owners, managers and workers

The hierarchy of asbestos controls mirrors the general occupational health hierarchy of risk controls: elimination, engineering controls, administrative controls, and personal protective equipment as a last resort. Applied to asbestos:

In the UK, Regulation 4 of the Control of Asbestos Regulations 2012 imposes a duty to manage asbestos on the owner or occupier responsible for maintenance of non-domestic premises. The duty is to: assess the presence and condition of ACMs; prepare and implement a management plan; review and monitor the plan; and provide information to anyone who might disturb the material. Critically, the duty to manage is not a duty to remove. Removal is required only where the assessment concludes it is the only way to adequately manage risk.

In France, the obligation de repérage and obligation de gestion are set out in the Code de la santé publique and the Code du travail. In Spain, equivalent obligations arise under Real Decreto 396/2006 and the Ley de Prevención de Riesgos Laborales. All three frameworks converge on the same principle: assessment and management first, removal only when necessary.

Before any task that might disturb or expose workers to an ACM, a specific written risk assessment must be prepared. This is distinct from the general asbestos survey report. The task-specific assessment must identify: the specific ACM that might be disturbed; how the task will be done; the likely fiber release rate (based on material type and condition); who will be in the area; and what controls will be implemented.

In the UK this is required under Regulation 11 of the Control of Asbestos Regulations 2012. Equivalent requirements apply in France and Spain under national occupational safety law. The risk assessment must be reviewed by a competent person and available on site before work begins. A verbal briefing is not sufficient.

The asbestos register is often treated as an archive document to be filed and forgotten. In practice, it should be a live operational tool consulted before any maintenance task involving the building fabric. Facilities managers should establish a system in which: any contractor or in-house maintenance worker must check the register before drilling, cutting, chasing or accessing ceiling voids, roof spaces or service risers; any work that will disturb a listed ACM is escalated for a formal work order with appropriate controls; and any newly discovered potential ACM is added as a 'suspected, not confirmed' entry pending laboratory sampling.

In the UK, the duty holder must review and update the register whenever: an ACM is found in a condition different from what the register describes; a new ACM is discovered; an ACM is removed, encapsulated or modified; or it has been more than 12 months since the last inspection of any in-place ACM. The register must be physically accessible to anyone who needs it — not locked in a head-office filing system in a different city from the building it describes.

The most common cause of accidental asbestos disturbance in managed buildings is not ignorance of the register, but failure to consult it. A qualified facilities manager knows the register exists; the plumber called in at short notice on a Friday afternoon may not. The management system must make asbestos awareness automatic, not optional:

When protective equipment is required for asbestos work, it must be appropriate to the task and fiber release potential. The UK HSE and EU OSHA frameworks distinguish between three levels of asbestos work, each with different PPE requirements:

Respiratory protection for asbestos is governed by assigned protection factors (APFs) — the factor by which the device reduces outside concentration at the breathing zone. The UK HSE and equivalent EU standards define the following for asbestos work:

If asbestos is disturbed accidentally during maintenance, renovation or any other activity: stop all work; evacuate the area; close off the space to prevent others from entering; and call a licensed asbestos contractor for emergency response. Do not attempt to clean up with a standard vacuum or broom.

The licensed contractor will carry out emergency air sampling to assess contamination extent, HEPA-vacuum all surfaces in the affected area, and carry out full decontamination before the area is cleared for re-entry. Anyone who was in the area during the disturbance should be identified and their potential exposure documented. Depending on the nature and extent of exposure, medical surveillance and regulatory reporting may be required.

Following any accidental asbestos disturbance in a building with other occupants, the duty holder must notify those occupants of what has happened, what precautions are being taken and when the area will be safe for re-entry. This is a legal obligation under most national frameworks and an ethical obligation in all situations. The notification should be clear and factual — avoiding language that either minimizes or catastrophizes the incident.

Post-incident air testing must be carried out by an independent accredited analyst using the four-stage clearance procedure. The pass threshold is 0.01 f/ml. The affected area must remain closed until clearance is confirmed in writing. Following a significant incident, the duty holder should also: review the asbestos register for accuracy; review the permit-to-work system to identify how the disturbance occurred; and consider whether additional physical markers or access restrictions are needed to prevent recurrence.