Asbestos vs Silica – Key Differences in Risk and Compliance
Asbestos and silica are two of the most common hazardous materials encountered on construction and renovation sites. While both pose serious health risks, understanding their differences is essential for effective risk management and compliance.
Health Risks
- Asbestos: Inhalation of asbestos fibres can cause asbestosis, lung cancer, and mesothelioma. Fibres can remain in the lungs for decades, making exposure extremely dangerous even at low levels.
- Silica: Respirable crystalline silica can cause silicosis, chronic bronchitis, and lung cancer. Unlike asbestos, silica dust often arises during cutting, grinding, or demolition of concrete, stone, or masonry.
Exposure Characteristics
- Asbestos: Fibres are often hidden in building materials like wall sheeting, roofing, and insulation. Exposure typically occurs when materials are disturbed during demolition or renovations.
- Silica: Dust is generated during active work on silica-containing materials and can remain airborne, affecting anyone nearby.
Regulatory Compliance
- Asbestos: NSW WHS laws require a survey and Asbestos Register before demolition or refurbishment. Licensed removal may be required for certain types of asbestos.
- Silica: High-risk silica work requires risk assessments, control measures, air monitoring, and SWMS under WHS regulations.
Key Takeaway
While both asbestos and silica are serious hazards, they differ in source, exposure pathways, and regulatory requirements. Engaging a qualified occupational hygienist ensures that both risks are properly assessed, monitored, and controlled, keeping workers and occupants safe.