Bridge Painting and Protective Coating

Bridge painting applies protective coatings to steel and concrete structures to prevent corrosion and extend service life.
Working at height on bridge structures requires specialist access including under-bridge units, suspended platforms, or rope access.
Lead-based paint is present on many older bridges — removal generates toxic lead dust requiring specific controls and health surveillance.
Blast cleaning with grit or shot creates extreme noise, dust, and debris requiring total containment sheeting and RPE.
Spray application of coatings creates a mist of paint particles and solvent vapour requiring forced ventilation and RPE.
COSHH assessments must cover every primer, intermediate, and finish coat product being applied to the bridge structure.
Isocyanate-containing coatings used in many bridge paint systems cause occupational asthma with repeated unprotected exposure.
Containment sheeting around the work area prevents paint, blast debris, and contaminated waste entering the watercourse below.
Working over live traffic, railways, or waterways requires additional protective measures to shield the public from debris.
Waste from bridge painting including old paint, blast grit, and contaminated sheeting must be disposed of as hazardous waste.

Lead paint exposure	Older bridges contain lead paint — removal without proper controls causes lead poisoning affecting the brain, kidneys, and blood.
Isocyanate asthma	Bridge coating systems frequently contain isocyanates — unprotected exposure causes permanent, irreversible occupational asthma.
Environmental containment	Paint and blast debris falling into rivers kills aquatic life — full containment sheeting is mandatory for all bridge painting work.

Do

Don't

Test existing paint for lead content before starting any removal or preparation.
Install containment sheeting to prevent debris reaching the watercourse or public areas.
Wear RPE rated for the specific hazard — lead dust, blast grit, or paint mist.
Follow the COSHH assessment for every coating product in the paint system.
Use forced ventilation when applying coatings in enclosed or sheeted work areas.
Attend health surveillance for lead exposure and isocyanate sensitisation as required.
Use specialist access equipment designed for under-bridge and over-water work.
Install protection over live traffic or railway lines beneath the bridge work area.
Dispose of all paint waste, blast grit, and contaminated sheeting as hazardous waste.
Brief the team on the coating system hazards and PPE requirements for each phase.

DON'T remove old bridge paint without testing for lead content first.
DON'T blast clean or paint without full containment sheeting to protect the environment.
DON'T work with lead dust or isocyanate coatings without the correct RPE grade.
DON'T apply coatings without reading the COSHH assessment for each specific product.
DON'T spray paint in enclosed areas without forced ventilation and extraction.
DON'T skip health surveillance if exposed to lead or isocyanate-containing products.
DON'T access bridge structures using improvised methods — use approved specialist access.
DON'T allow debris to fall onto traffic, railway lines, or waterways below the bridge.
DON'T put bridge painting waste in general skips — it is classified as hazardous waste.
DON'T begin work without briefing the team on hazards specific to each coating phase.

See also: Bridge Construction Safety Awareness | Painting and Decorating Safety

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