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. The engineered stone ban took effect across Australia on 1 July 2024, making Australia the first country in the world to prohibit the manufacture, supply, processing, and installation of engineered stone benchtops and similar products. The ban was introduced because of the extreme silicosis risk the material posed to stonemasons — engineered stone typically contains 85 to 95 per cent crystalline silica by weight, compared to 25 to 35 per cent for natural stone and concrete, and cutting or polishing it generated RCS concentrations many times the workplace exposure standard. Between 2019 and 2024 hundreds of accelerated silicosis cases were diagnosed in Australian stonemasons, triggering the national ban. The ban did not eliminate silica risk from construction. Every time a worker cuts, grinds, drills, chases, or demolishes concrete, masonry, brick, sandstone, granite, mortar, or natural stone, respirable crystalline silica is generated. Concrete contains 25 to 35 per cent crystalline silica. Mortar contains 20 to 40 per cent. Sandstone can exceed 70 per cent. Bricks typically contain 10 to 25 per cent. These materials are used on virtually every Australian construction site, which means silica exposure is a universal risk that must be addressed in SWMS for concreting, demolition, excavation, bricklaying, tiling, and related trades. From September 2024, NSW introduced mandatory silica awareness training for all workers exposed to RCS, and other jurisdictions are following. The current workplace exposure standard for respirable crystalline silica in Australia is 0.05 mg/m3 as an 8-hour time-weighted average under WHS Regulation 2025 Schedule 10. Some jurisdictions are reviewing this standard downward. Dry cutting of silica-containing materials without effective dust controls is prohibited under the Regulation. This template is developed in accordance with WHS Regulation 2025 Chapter 7 (Hazardous chemicals), the Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace (2020), the Code of Practice: Working with Silica and Silica-Containing Products (2024), the National Guide for the Prevention of Silicosis (Safe Work Australia, 2023), AS/NZS 1715 (Selection, use and maintenance of respiratory protective equipment), and AS/NZS 1716 (Respiratory protective devices). It must be reviewed, customised for the specific site and activities, and developed in consultation with workers before use.
Legal Requirements
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)
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: 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)
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Hazards
| Hazard | Consequence | Likelihood |
|---|---|---|
| Inhalation of respirable crystalline silica during concrete cutting with circular saw, wall saw, or floor saw | Inhalation of RCS causes silicosis, an irreversible and progressive lung disease. Chronic silicosis develops after 10 to 30 years of exposure and causes progressive shortness of breath, reduced lung function, and respiratory failure. Accelerated silicosis can develop within 5 to 10 years of heavy exposure. Acute silicosis from very high-level exposure can develop within months and is rapidly fatal. Silica is classified as a Group 1 carcinogen (causes cancer in humans) by the International Agency for Research on Cancer and is associated with lung cancer, kidney disease, and autoimmune disorders including scleroderma and rheumatoid arthritis. | Almost Certain (A) without effective dust controls — dry cutting routinely generates concentrations 20 to 100 times the workplace exposure standard |
| Silica dust from grinding and polishing concrete surfaces and masonry | Grinding concrete, masonry, and stone generates high concentrations of fine respirable dust that remains airborne for extended periods and penetrates deep into the lungs. Accelerated silicosis can develop within 2 to 5 years of regular grinding work without effective controls. Cumulative exposure causes permanent lung function loss and elevates lung cancer risk. Grinding with abrasive discs is one of the highest-exposure silica tasks in construction. | Likely (B) — common during surface preparation, finishing, and polishing work |
| Dust generation during demolition of concrete structures, masonry walls, and brickwork | Demolition activity generates widespread dust dispersal affecting not only the demolition worker but every person in the vicinity. Silica dust can travel 10 to 15 metres from the source and remains airborne long after the activity ceases. Outcomes include silicosis in demolition workers and bystanders, and accelerated disease in workers who carry out multiple demolition jobs per year. The risk is elevated where the demolition occurs in enclosed or poorly ventilated spaces. | Almost Certain (A) without water suppression and ventilation controls |
| Drilling into concrete and masonry using rotary hammer drills, core drills, and percussion drills | Drilling creates a localised high-concentration dust plume at the drill point, positioned directly in the worker's breathing zone. Core drilling for services penetrations and anchor bolting are common construction tasks that generate RCS. Cumulative exposure over a career causes silicosis and elevated disease risk. | Likely (B) — routine on every construction site without on-tool dust extraction |
| Dry sweeping or compressed air cleaning of concrete dust and debris | Dry 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. Compressed air blowdown of settled dust creates similar or higher exposures. Both activities are prohibited under the Code of Practice for any silica-containing dust and must be substituted with HEPA vacuum cleaning or wet methods. | Likely (B) where dry cleanup practices are still used |
| Excavation and earthworks in sandstone, granite, or silica-rich soils | Excavation in silica-rich geology generates airborne dust from cutting, loading, and transport operations. Sandstone excavations in the Sydney region, granite excavations in the Adelaide Hills and southeast Queensland, and silica-rich alluvial soils all expose workers to RCS during civil and mining construction work. Dry conditions and wind elevate exposure levels. | Possible (C) — elevated during dry conditions and in sandstone geology |
| Bystander exposure — workers positioned near cutting and grinding operations | Silica dust generated by one worker affects other workers in the vicinity. Without physical separation or localised controls, bystanders can receive significant exposure even though they are not performing the dust-generating task themselves. The risk is elevated on open construction sites with multiple trades working in the same area. | Likely (B) — routine on any multi-trade site without exclusion zones around silica-generating work |
| Contaminated clothing — silica dust carried home on work clothes | Dust settled on work clothing, footwear, and hair is carried home and creates secondary exposure for family members (para-occupational silicosis). Historic cases of silicosis in the wives of construction workers have been documented in Australia and internationally, and are a recognised mechanism of non-occupational disease. | Possible (C) without decontamination facilities on site |
| Long-term low-level exposure over a construction career | Even exposure below the workplace exposure standard, sustained over a career, causes cumulative lung damage and increases the risk of silicosis. Chronic silicosis develops 10 to 30 years after first exposure and is irreversible by the time symptoms appear. The only effective strategy is to maintain exposures as low as reasonably practicable (ALARP), well below the workplace exposure standard rather than at it. | Likely (B) over a 20 to 40 year career without rigorous exposure controls |
| Combined exposure — silica dust plus diesel exhaust, welding fumes, and asbestos | Construction workers are frequently exposed to multiple respiratory carcinogens simultaneously. Silica plus diesel exhaust, silica plus welding fume, and silica plus asbestos create compounded respiratory damage and elevated lung cancer risk. The health risks of combined exposure are greater than the sum of individual exposures, and SWMS should identify all co-exposures in the work environment. | Possible (C) on sites with multiple trades and combustion sources |
Controls (Hierarchy of Controls)
Recent Prosecutions
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
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
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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