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Silica SWMS: Managing Respirable Crystalline Silica Dust in Construction

Respirable crystalline silica (RCS) is one of the most dangerous occupational hazards on Australian construction sites and one of the highest enforcement priorities of Safe Work Australia and the state regulators. Inhalation of RCS dust causes silicosis — an irreversible, progressive lung disease that can develop into fatal fibrosis, lung cancer, kidney disease, and autoimmune disorders. There is no cure. Once the fibrotic damage to the lungs is established, it is permanent. The only effective management is prevention of exposure in the first place, and a compliant Safe Work Method Statement is the primary regulatory mechanism for documenting how that prevention will be achieved on a specific site.

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Legal Requirements

regulation

WHS Regulation 2025 Chapter 7 — Hazardous Chemicals; WHS Regulation 2025 Part 6.1 Division 3 — High Risk Construction Work where the activity triggers a separate HRCW category (demolition, excavation, confined spaces)

hrcw category

Silica exposure itself is not a separate HRCW category but is a hazardous chemical under Chapter 7 of the Regulation. Silica-generating work routinely occurs within HRCW categories including demolition, excavation deeper than 1.5 metres, confined space, and powered mobile plant (WHS Regulation 2025 Schedule 1)

code of practice

Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace (2020); Code of Practice: Working with Silica and Silica-Containing Products (2024); National Guide for the Prevention of Silicosis (Safe Work Australia, 2023)

section 26a binding

true

Hazards

HazardConsequenceLikelihood
Inhalation of respirable crystalline silica during concrete cutting with circular saw, wall saw, or floor sawInhalation of RCS causes silicosis, an irreversible and progressive lung disease.Almost Certain (A) without effective dust controls
Silica dust from grinding and polishing concrete surfaces and masonryGrinding concrete, masonry, and stone generates high concentrations of fine respirable dust that remains airborne for extended periods and penetrates deep into the lungs.Likely (B)
Dust generation during demolition of concrete structures, masonry walls, and brickworkDemolition activity generates widespread dust dispersal affecting not only the demolition worker but every person in the vicinity.Almost Certain (A) without water suppression and ventilation controls
Drilling into concrete and masonry using rotary hammer drills, core drills, and percussion drillsDrilling creates a localised high-concentration dust plume at the drill point, positioned directly in the worker's breathing zone.Likely (B)
Dry sweeping or compressed air cleaning of concrete dust and debrisDry sweeping of settled silica dust re-suspends the particles into the breathing zone at concentrations that can exceed the workplace exposure standard by 10 to 50 times.Likely (B) where dry cleanup practices are still used
Excavation and earthworks in sandstone, granite, or silica-rich soilsExcavation in silica-rich geology generates airborne dust from cutting, loading, and transport operations.Possible (C)
Bystander exposure — workers positioned near cutting and grinding operationsSilica dust generated by one worker affects other workers in the vicinity.Likely (B)
Contaminated clothing — silica dust carried home on work clothesDust settled on work clothing, footwear, and hair is carried home and creates secondary exposure for family members (para-occupational silicosis).Possible (C) without decontamination facilities on site
Long-term low-level exposure over a construction careerEven exposure below the workplace exposure standard, sustained over a career, causes cumulative lung damage and increases the risk of silicosis.Likely (B) over a 20 to 40 year career without rigorous exposure controls
Combined exposure — silica dust plus diesel exhaust, welding fumes, and asbestosConstruction workers are frequently exposed to multiple respiratory carcinogens simultaneously.Possible (C) on sites with multiple trades and combustion sources

Controls (Hierarchy of Controls)

[Elimination] Specify pre-cut, pre-formed, or prefabricated concrete elements to eliminate on-site cutting — design drawings specify cut locations and dimensions so that elements arrive ready for installation
[Elimination] Eliminate engineered stone — the national ban from 1 July 2024 prohibits manufacture, supply, and installation of engineered stone products; no SWMS can lawfully permit processing of engineered stone
[Substitution] Substitute dry cutting with wet cutting using water-fed saws, cores, and grinders — water suppression at the cutting point reduces airborne RCS by 85 to 95 per cent
[Substitution] Substitute abrasive disc cutting with diamond wire cutting, diamond wall saws, or hydraulic splitting where practicable to reduce dust generation at the source
[Substitution] Substitute high-silica materials with low-silica alternatives where the specification permits — some polymer-modified materials have significantly lower crystalline silica content
[Isolation] Establish exclusion zones around cutting, grinding, and drilling operations — minimum 10 metres radius with signage and barricading to keep bystanders out of the dust plume
[Isolation] Enclose cutting stations with physical barriers, curtains, or full enclosures with extraction fans and HEPA filters for repetitive and high-exposure operations
[Engineering] Install local exhaust ventilation (LEV) at the source of dust generation — on-tool extraction with tool-triggered HEPA-filtered vacuum for handheld grinders, drills, and saws
[Engineering] Provide continuous water suppression at the cutting point — minimum flow rate 0.5 L/min at the blade or drill bit, with slurry collection and disposal
[Engineering] Use cutting equipment designed for dust extraction — wall saws and floor saws with integrated water supply and extraction
+ 12 more controls included in the full template

Recent Prosecutions

SafeWork NSW engineered stone enforcement activity (pre-ban)Court-imposed penalties and enforceable undertakings

SafeWork NSW pursued multiple prosecutions against engineered stone fabricators between 2020 and 2024 following diagnosed cases of accelerated silicosis in stonemasons. Common findings included dry cutting of engineered stone without water suppression, absence of air monitoring, absence of health surveillance, inadequate respiratory protective equipment, and SWMS documents that either did not exist or listed 'wear a dust mask' as the sole control for silica exposure. Silicosis diagnoses and prosecutions contributed to the national engineered stone ban from 1 July 2024.

2024 — SafeWork NSW engineered stone enforcement programme

WorkSafe Victoria silicosis enforcement programmeMultiple prosecutions with fines from $100,000 to $400,000 per case

Between 2019 and 2024, WorkSafe Victoria identified over 300 cases of silicosis in the engineered stone industry and initiated enforcement against multiple fabricators. The investigation and enforcement outcomes were the principal evidence base for the national engineered stone ban. Common findings included absence of silica-specific SWMS, inadequate respiratory protection, absence of health surveillance, and workplace exposure monitoring that was not conducted or not used to inform controls.

2024 — WorkSafe Victoria silicosis enforcement programme

What Your SWMS Must Include

✓Respirable crystalline silica identified as a specific hazard (not merely 'dust') with reference to the workplace exposure standard of 0.05 mg/m3 (8-hour TWA)
✓Source identification listing each task that generates RCS and the estimated silica content of the materials involved
✓Water suppression specifications including minimum flow rate, supply method, and slurry management and disposal
✓Local exhaust ventilation specifications including extraction unit type, HEPA filter rating, positioning, and maintenance schedule
✓Air monitoring plan including when monitoring will be performed, sampling method, NATA-accredited laboratory analysis, and use of results to inform controls
✓Health surveillance programme including baseline spirometry and chest X-ray, follow-up schedule, and reporting of results to workers
✓Respiratory protective equipment programme including respirator type (minimum P2 half-face), fit-testing records, clean-shaven policy, replacement schedule, and user training
✓Exclusion zones around cutting and grinding operations including minimum distances, signage, and barricading
✓Cleanup procedures specifying wet cleanup or HEPA vacuum only, prohibition on dry sweeping and compressed air blowdown
✓Decontamination arrangements including clothing change, shower facilities, and separate laundering
+ 3 more requirements covered in the full template

Silica Kills. Your SWMS Should Address It Properly.

This SWMS template pre-loads silica-specific hazards and controls — water suppression, LEV, air monitoring, health surveillance, and RPE selection. Not just 'wear a dust mask'. Your first SWMS is free.

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