Screen First, Blast Second: Asbestos Checks in Legacy Coating Removal

Legacy coatings are usually treated as a surface problem: poor adhesion, chalking, corrosion beneath the film, or a finish that no longer meets specification. For a blast contractor, however, the more serious question may be what the coating contains. Asbestos was historically used in industrial paints, bituminous coatings, mastics, sealants and reinforced surface treatments. Abrasive blasting can break those materials into fine, respirable debris and spread contamination across media, PPE, plant and enclosure surfaces. The following protocol is intended for UK contractors asked to blast steel, masonry or industrial plant that may carry such coatings. It is not a substitute for specialist asbestos advice, but it identifies the checks that should be completed before the first grit is released.

Establish the information trail before pricing

The client or dutyholder should be able to provide an asbestos register, previous survey reports, refurbishment records and any known history of coating systems on the asset. That information belongs in the tender pack, not in a verbal handover on the morning of mobilisation. If records are missing, contradictory or simply state that the coating is original, the quotation should include an allowance for investigation. A contractor who prices blasting on the assumption that old paint is inert is taking a commercial and legal risk that no day rate can justify.

The pre-start meeting should identify who controls the premises, who controls the work and how asbestos information will be exchanged. On construction sites, the CDM 2015 management arrangements should make that chain clear. On occupied industrial sites, the duty to manage under the Control of Asbestos Regulations 2012 sits with the premises dutyholder, but the blast contractor still has duties to its own employees and others affected by the work.

Commission the right survey and sampling regime

Where the asset is to be refurbished, repainted or demolished, a refurbishment and demolition asbestos survey should be carried out before intrusive work. The survey should be completed by a competent surveyor and should specifically consider coating layers, not just obvious insulation or board products. Paints, bitumens and mastics can be overlooked if the survey is focused only on plant and building fabric.

Bulk sampling should be undertaken by a competent person and analysed by a UKAS-accredited laboratory. A single scrape from the topcoat may not be enough. Coating systems can be built up over decades, and asbestos may be present in an intermediate layer, a primer or a reinforcement. Sample locations, depths and descriptions should be recorded so that the results can be matched to the blasting sequence. Until a laboratory report confirms otherwise, suspect material should be presumed to contain asbestos.

Apply the legal decision tree before mobilisation

Once asbestos is confirmed or presumed, the work should be assessed against the Control of Asbestos Regulations 2012. The key question is not whether blasting is convenient, but whether the coating can be removed without disturbing asbestos. In most cases, abrasive blasting is not an appropriate method for removing or disturbing asbestos-containing material. The coating should be removed by a licensed asbestos removal contractor using an agreed method before the blast programme begins. If the material is not licensable, the contractor must still confirm that the work is notifiable non-licensed work where applicable and that the required controls, training and records are in place.

Licensed asbestos work must be notified to the Health and Safety Executive in advance, and the notification should be consistent with the method statement and enclosure design. The blast contractor should not accept a clearance certificate as a substitute for its own pre-start inspection. It should verify that the removal contractor has demobilised, that the enclosure has been cleared, and that any residual material has been removed from ledges, ducts and plant surfaces.

Control the interface between removal and blasting

The handover between asbestos removal and abrasive blasting is a high-risk point because responsibilities can become blurred. The blast contractor should agree a permit-to-work or formal release procedure with the dutyholder. That procedure should confirm the scope of removal, the clearance status, the condition of the substrate, and the boundary between clean and controlled areas. Where an enclosure remains in place, the blast contractor should not breach it without agreement.

Decontamination arrangements should be in place for personnel, tools and mobile plant leaving the controlled area. Spent abrasive, coating debris, filters and disposable PPE should not be treated as ordinary site waste. They should be segregated at the point of production, packaged in suitable UN-approved containers where required, labelled and consigned through a licensed carrier to a permitted waste facility. In Scotland, the special waste consignment regime applies; elsewhere in the UK, hazardous waste consignment notes should be completed and retained.

Respond correctly when unexpected material appears

Even a well-planned job can reveal a coating that was not sampled or a substrate repair that was hidden beneath a previous finish. If a suspect material is uncovered, the correct response is to stop blasting, isolate the area and prevent unnecessary access. Dry sweeping and compressed-air cleaning should not be used to disperse the material. The dutyholder should be informed, the material should be assessed and sampled, and the work should not restart until the asbestos status is confirmed and the method statement has been revised.

Contaminated PPE and plant should be decontaminated under controlled conditions or quarantined pending advice. The incident should be recorded, including the location, the action taken and the people affected. That record supports both health and safety management and any later commercial discussion about delay or variation.

Use air monitoring and clearance as verification, not reassurance

Air monitoring can provide useful confirmation that controls are working, but it does not replace engineering controls, RPE or proper enclosure management. For licensed work, clearance procedures should be carried out by an independent competent analyst after the removal contractor has completed cleaning. A visual inspection, smoke test and fibre counting regime should be appropriate to the enclosure and the work method. Background monitoring may also be useful where blasting takes place near occupied areas, but the results should be interpreted by a competent person and retained with the site records.

Close the loop at handover

The completion pack should include survey reports, laboratory certificates, removal records, clearance documentation, waste consignment notes and the revised asbestos register entry. The client should be told what was found, what was removed and what remains in place. That information matters for future maintenance, repainting and further blasting. A handover that leaves the next contractor guessing is not a complete handover.

FlowTech Blasting supplies equipment for surface preparation, but no nozzle setting or compressor specification can compensate for an absent asbestos screen. The practical rule is straightforward: establish what is in the coating, remove what must be removed under the correct regime, and only then plan the blast. Screen first, blast second.