Demolition asbestos survey

Survey the demolition scope, not a convenient sample

For complete demolition, the survey scope should normally cover the entire building or structure. For partial demolition, it should follow the actual work boundary and include adjoining fabric, service routes and interfaces that could be broken into, cut through or exposed.

The recognised term in HSE guidance is a refurbishment and demolition survey. Where demolition is planned, the brief must state exactly what is being removed. A vague instruction such as survey the affected area is not enough for a complex building.

Marked drawings are useful, but they should be checked against the site. Extensions, infilled openings, boxed services and later alterations are often missing from old plans.

Areas commonly missed before demolition

The obvious rooms are rarely the whole problem. Demolition exposes concealed construction from every period of the building, including later repairs and fire protection added around plant or escape routes.

• Ceiling, floor and wall voids
• Risers, ducts, shafts and service penetrations
• Basements, undercrofts, roof spaces and lift installations
• Boiler rooms, plant rooms and redundant heating systems
• Cladding, soffits, roofing products and rainwater goods
• Buried ducts, service trenches and attached outbuildings within the works

Older industrial and commercial buildings can contain sprayed coatings, insulation residues, asbestos insulating board, cement products, rope seals, gaskets, bitumen materials, floor tiles and textured coatings in separate construction layers. One visible product does not account for what sits behind it.

Expect destructive access

A demolition asbestos survey is not designed to preserve finishes. The surveyor may need to lift floor coverings, open partitions, break through boxing, inspect behind cladding, enter ceiling voids and expose concealed services. The intrusion should be sufficient to find materials that demolition could disturb, so far as reasonably practicable.

Whole-building surveys are normally undertaken after the property has been vacated and cleared. Stored goods, fixed furniture and redundant equipment can prevent access to the very locations that need inspection. Where part of a building remains occupied, the survey boundary, isolation arrangements and reinstatement requirements need careful agreement before work starts.

Make the building safe to inspect

Intrusive surveying introduces risks beyond asbestos. Electrical supplies, gas, water, steam and process services may need isolation. Fragile roofs, unstable floors, fire damage, confined spaces, chemicals and unsafe access routes must be identified before attendance.

The client should provide available plans, previous asbestos information, structural warnings and details of live services. These records help the surveyor plan access, but they do not replace physical inspection.

Sampling and presumed materials

Suspect materials are sampled where it is safe and appropriate to do so. Bulk samples used to confirm asbestos content should be analysed by a laboratory accredited for that activity. The report should connect each result to a clear location, photograph or plan reference.

Where a material cannot be sampled, it may need to be recorded as presumed asbestos. Presumption is a control decision, not a visual diagnosis. Colour, texture and building age can guide an experienced surveyor, but they cannot confirm asbestos content on their own.

Limitations must be specific

Some exclusions are unavoidable, particularly where access would create an immediate structural or safety risk. A useful report states exactly what was not inspected, why access failed and what must happen before demolition reaches that area.

Generic wording such as access was restricted throughout gives the demolition team little to work with. An uninspected location should be treated as potentially containing asbestos until it has been investigated or controlled under an appropriate plan.

What the report should tell the demolition team

The report should identify confirmed and presumed asbestos-containing materials, their location, apparent extent and condition. It should include marked plans, photographs, sample references and a clear schedule of inaccessible areas.

Designers and contractors use this information to plan enabling works, asbestos removal, sequencing and site controls. The survey report does not replace the contractor’s risk assessment or plan of work, and it cannot account for concealed materials in locations the surveyor was prevented from reaching.

Check the report before work starts

Do not accept a report simply because it carries the right title. Check that the stated scope matches the demolition package and that every exclusion can be located on a drawing or understood from the description.

• The correct buildings, floors and external structures are included
• Partial-demolition interfaces are clearly defined
• Intrusive access is recorded in the areas demolition will disturb
• Samples and presumed materials have unambiguous references
• Plans correspond with the written register
• Limitations identify a practical next action

A management survey is not a substitute for a demolition-scope inspection. It is intended for normal occupation and maintenance, so concealed materials may remain outside its inspection scope.

Removal and demolition are separate stages

The survey identifies the asbestos information needed for planning. It is not evidence that asbestos has been removed, and it does not certify an area as ready for unrestricted demolition.

Identified materials must be assessed against the planned work. Where removal is required, the method, contractor competence, licensing position, clearance arrangements and waste controls should be established before demolition proceeds.

Guidance basis: the Control of Asbestos Regulations 2012, HSE publication HSG264, HSE guidance on asbestos surveys and UKAS requirements for accredited asbestos inspection and bulk analysis activities.