Testing the Coat, Not the Assumption: Lead Paint Controls for UK Blasting Projects

Legacy coatings rarely announce themselves. A steel frame may carry a chalky topcoat over a zinc-rich primer, or a flaking finish over an older lead-bearing layer that has been painted over more than once. Asbestos surveys rightly sit at the front of pre-blast planning, but lead-based paint deserves its own decision record. Abrasive blasting does not simply remove a coating; it turns it into dust, fines and contaminated debris that can travel through plant, clothing and waste streams. For UK contractors, the question is not whether lead is present in every job. It is how the project proves what is present and how controls follow from that evidence.

Start with a coating survey, not a visual guess

Lead paint cannot be identified by colour, age or gloss. A pre-blast survey should record coating history where available, building and maintenance records, and the extent of intact, flaking or previously repaired areas. Sampling should be planned rather than opportunistic: representative locations, all suspect layers, edges and damaged zones, with photographs and a chain-of-custody record. Portable XRF can screen coatings quickly, but results should be confirmed by a UKAS-accredited laboratory where the finding will drive COSHH controls, waste classification or client decisions. The sampling plan, results and interpretation belong in the project file before the nozzle is fitted.

COSHH and the Control of Lead at Work Regulations

Lead is governed by COSHH and by the Control of Lead at Work Regulations 2002. In practice, the two duties meet in a written assessment that covers blasting, sweep-up, waste handling, equipment cleaning and any maintenance of extraction plant. The assessment should identify who may be exposed, how lead can enter the body, and what significant exposure means for the task. Inhalation is the obvious route; ingestion from contaminated hands, clothing and surfaces is just as important on a blasting site. Where significant exposure is possible, the assessment should set out exposure monitoring, health surveillance and the occupational hygiene advice that supports both.

Build containment around the dust, not the nozzle

Controls should follow the dust path. Blast enclosures need sealed joints, negative pressure where practicable, HEPA filtration and cleanable surfaces. Exclusion zones should keep non-essential people out, and access should be controlled at the boundary. RPE must be suitable for the airborne lead concentration and fit-tested; for blast operators, that usually means the supplied-air helmet system already used for abrasive blasting, but the assessment still needs to confirm the assigned protection factor and the condition of the equipment. Coveralls, gloves and boot protection should be chosen for dust resistance, not just abrasion. Welfare arrangements matter: separate clean and dirty zones, washing facilities, no eating or drinking in the work area, and a change regime that prevents lead dust leaving site on clothing.

Treat waste as a classified material, not sweepings

Spent abrasive, paint residues, filters, disposable PPE and contaminated water can all carry lead. Waste should be segregated at source and classified under the relevant UK waste assessment framework, with the hazardous properties recorded. Consignment notes, registered carrier details and permitted receiving-site records should be retained alongside the project file. Mixing lead-contaminated debris with general blast waste can increase the hazardous waste volume and weaken the audit trail. The client should receive the waste records as part of handover, not as an afterthought.

Keep the client trail visible

Lead paint decisions are difficult to defend if they exist only in a site supervisor's memory. The client, principal designer and principal contractor should see the sampling plan, laboratory results, COSHH and lead assessment, method statement and any change control when unexpected coatings are found. Under CDM 2015, pre-construction information should be shared and updated; for facilities managers, the handover pack should identify where lead-bearing coatings remain, what was removed, and what residual contamination checks were done. A short lead register with sample locations, results and actions is often more useful than a lengthy narrative.

Close with evidence

At completion, the record should show that controls matched the findings: containment, RPE, monitoring, waste classification and client approval. Visual inspection and, where required, air monitoring should be documented. The aim is not paperwork for its own sake. It is to ensure that the next contractor, the client and the regulator can see why each decision was made. Lead paint may be hidden under newer coatings, but the control regime should never be hidden in the job file.