Intumescent coating can be applied while a wider construction project remains active, but it requires deliberate coordination. Steel must be accessible, suitably prepared and protected from contamination while each layer dries. Other trades, temporary works, access equipment and inspection points therefore need to be incorporated into the programme rather than treated as last-minute obstacles.
Key points
- Agree work zones, access and interfaces before mobilisation.
- Protect preparation and coating activities from dust, water, overspray and physical damage.
- Sequence coats using actual product drying requirements and recorded site conditions.
- Allow inspection and remedial work before access is removed or steel is concealed.
Start with reliable project information
The application team needs current drawings, steel-member identification, the coating schedule, primer details, product system and programme. Changes should be communicated through a controlled route so site teams do not work from superseded information.
A pre-start review should identify design gaps, restricted areas, incomplete steelwork, connection changes and interfaces with ceilings, partitions, services and cladding.
Define zones and access
Breaking work into identifiable zones helps coordinate preparation, application, inspection and release. Each zone should have suitable access to all required faces, including webs, connections and areas close to decks or walls.
The party responsible for scaffolding or mobile access should be clear. Moving access prematurely can turn a straightforward inspection or repair into a costly return visit.
Control dust, water and overspray
Grinding, cutting, concrete work and general site traffic can introduce contamination. Wet trades, leaks or open elevations can expose fresh coating to moisture. Spraying also requires protection of adjacent surfaces and management of airborne material.
Containment, ventilation and segregation should suit the product, area and risk assessment. Product safety information and the HSE’s construction dutyholder guidance should be considered within the wider site arrangements.
Plan around drying, not only application speed
The time taken to spray is only one part of the programme. Coats need to dry sufficiently before overcoating, and conditions can extend published minimum times. Maximum applied thickness per pass must also be respected.
Programme promises should therefore be based on the selected system, anticipated conditions and access—not a generic production rate.
Inspection and release
Agree who inspects, what is recorded and when a zone can be released. Wet-film checks occur during application; dry-film measurements require adequate drying. Defects and incomplete areas should be closed out before concealment.
The agreed records can support handover for the coating scope. They do not guarantee the performance of unrelated work or the building’s regulatory approval.
Protect completed work
Finished coatings can be damaged by impact, welding, service installation and removal of access equipment. Responsibility for protection and reporting damage should be established at handover of each area.
Our on-site application service is structured around coordinated work zones and the information available for each project.
Frequently asked questions
Can intumescent coating be applied while other trades are working?
Yes, where the activities are safely separated and do not contaminate, obstruct or damage the coating work. Zone planning is normally required.
Can a programme date be guaranteed before the product is selected?
A reliable duration requires the system, quantities, coat build, access and conditions. Early estimates should state their assumptions.
When can ceilings or partitions close the steelwork?
Only after the required application, drying, inspection and remedial activities for that area have been completed and the agreed release has been given.
Discuss your project
For programme planning, send Fire Coatings the construction programme, drawings, access plan and coating schedule available.
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