Intumescent Fire-Rated Coating SWMS

Intumescent fire-rated coating application to structural steelwork is specialised passive fire protection work that combines hazardous chemical handling, abrasive surface preparation, work at heights on scaffold or EWPs, and precision dry film thickness (DFT) verification against fire engineering specifications. The work is classified as High Risk Construction Work under WHS Regulation 2025 r291 because it routinely involves work above two metres, exposure to hazardous chemicals including isocyanates and solvents, and structural elements where coating failure has life-safety consequences during a fire event. A documented Safe Work Method Statement is mandatory before work commences, must be prepared in consultation with workers performing the task, and must remain accessible on site for the duration of the activity. This SWMS template addresses the full coating cycle — substrate preparation, primer and basecoat application, intumescent build-coat application, topcoat sealing, and DFT verification with calibrated wet and dry film gauges — and aligns controls to AS/NZS 2312, AS 4100, and the relevant passive fire protection Codes of Practice.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Specify shop-applied intumescent coating in fabricator's controlled environment wherever fire engineer approves, eliminating site-based spray application and overhead heights work entirely.
2. 2Elimination — Remove personnel from coating zone during spray application using exclusion barricades and programmed sequencing so only the applicator and pot-tender remain within ten metres.
3. 3Substitution — Select water-borne intumescent systems compliant with AS 4587 in place of solvent-borne products where the fire resistance level and substrate compatibility permit equivalent performance.
4. 4Substitution — Replace open abrasive blasting with vacuum-shrouded power tool cleaning to SSPC-SP11 standard where coating manufacturer permits, eliminating airborne silica generation.
5. 5Engineering — Install local exhaust ventilation with HEPA filtration at the spray face and provide forced dilution ventilation achieving minimum six air changes per hour in enclosed steel areas.
6. 6Engineering — Use modular birdcage scaffold with full edge protection to AS/NZS 1576 or knuckle-boom EWP with operator certification, eliminating reliance on personal fall arrest as primary control.
7. 7Administrative — Conduct daily pre-start review of this SWMS with all applicators, verify SDS comprehension for each two-pack system, and record sign-on before tools are issued from the store.
8. 8Administrative — Implement DFT verification regime using calibrated elcometer gauges at one reading per ten square metres minimum, with hold points logged against the fire engineer's specification before topcoat application.
9. 9PPE — Issue supplied-air respirators with full-face hood for spray operations involving isocyanate-containing products, and air-fed half-mask plus eye protection for roller and brush touch-up work.
10. 10PPE — Mandate chemical-resistant nitrile gauntlets, disposable Type 5/6 coveralls changed each shift, and twin-lanyard fall arrest harness clipped to engineered anchor points rated to AS/NZS 1891.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a six-storey commercial office fitout requiring upgrade of exposed structural steel to a 90/90/90 fire resistance level, the coating supervisor opens this SWMS at the 6:30am pre-start brief in the site shed. The crew of four — two applicators, one pot-tender, one DFT inspector — work through the hazard register on the printed document, focussing the morning's discussion on isocyanate exposure because the topcoat being mixed that day is a two-pack polyurethane. The supervisor confirms the supplied-air compressor has been Grade D tested within the last month, points to the engineering control row, and physically demonstrates the LEV setup on the boom lift basket. Each worker signs the consultation register on page four of the SWMS before tools are released. Mid-shift, a structural inspector flags that two beams in grid line C have received only 1.8mm DFT against a 2.4mm specification. The applicator returns to the SWMS administrative controls section, follows the documented DFT hold-point procedure, isolates the affected beams with hazard tape, records the non-conformance on the daily log clipped to the SWMS, and schedules a recoat for the following shift once the basecoat has cured to manufacturer specification. The document drives the field decision rather than sitting in a folder.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Managing the Risk of Falls at Workplaces CoP

Frequently asked questions