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Safety & OSHAaka: crystalline silicaaka: respirable silicaaka: silica dust

Silica Exposure

In Plain English

The hazard of breathing in fine dust from concrete and stone that can cause permanent lung disease.

Definition

Silica exposure occurs when workers inhale respirable crystalline silica dust generated by cutting, grinding, drilling, or blasting materials containing quartz, such as concrete, masonry, stone, and sand. Prolonged exposure causes silicosis, lung cancer, and other serious diseases. OSHA's silica standard (29 CFR 1926.1153) requires engineering controls, exposure assessment, written exposure control plans, medical surveillance, and respirators.

Why It Matters in Bidding

Silica controls are an OSHA compliance cost that estimators must build into any bid involving concrete, masonry, or stone cutting, since dust suppression, vacuum-equipped tools, exposure assessment, and a written control plan all carry real labor and equipment cost. Underpricing these controls exposes the contractor to citations, work stoppages, and schedule impacts, so a compliant bid reflects engineering controls and the safety overhead rather than assuming dry cutting with no protection.

Example

Bidding interior concrete sawing, the estimator adds wet-cutting and vacuum-equipped grinders, a written exposure control plan, and respirator costs to the line item to meet the OSHA silica standard.

Related Terms

Personal Protective Equipment (PPE)Hazardous MaterialOSHASite Safety Plan

Related Tools & Templates

Silica Exposure Control Plan

Frequently Asked Questions

It adds cost for engineering controls like water suppression and HEPA vacuum dust collection, exposure assessment, the written exposure control plan, training, respirators, and medical surveillance. Estimators should embed these in the labor and equipment for any cutting, grinding, or drilling of silica-bearing materials rather than treating compliance as optional overhead.
Concrete cutting and coring, masonry and tuckpointing, demolition, abrasive blasting, drilling into concrete or stone, and dry sweeping of silica dust. Any scope generating respirable crystalline silica falls under the OSHA standard, so estimators should flag these activities during takeoff and confirm the protective measures the sub will carry.
Common compliant methods include wet cutting that applies water at the point of dust generation and tools fitted with integrated HEPA vacuum dust collection. The standard's control table pairs specific tasks with required controls, and where those are followed, additional exposure monitoring may not be required, which simplifies the contractor's compliance approach.

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