Silica, Asbestos & Lead

Three invisible health hazards that cause serious — often delayed — disease.

Silica

Respirable crystalline silica from cutting or grinding concrete, masonry, and stone causes lung disease. Control it with water (wet cutting), dust collection, and respirators.

Asbestos

Common in older building materials. Disturbing it releases fibers that cause cancer. Older buildings must be surveyed and abated by licensed professionals before demolition or renovation.

Lead

Lead paint in older buildings is toxic, especially to children. Federal RRP rules require certified, lead-safe work practices on pre-1978 buildings.

Going Deeper (Intermediate)

Three "invisible" exposures with their own OSHA standards — all cause disease years later:

• Respirable crystalline silica (1926.1153) — from cutting/grinding concrete, masonry, stone. Causes silicosis, lung cancer, COPD. PEL = 50 µg/m³ (8-hr TWA); action level 25.
• Asbestos (1926.1101) — older insulation, flooring, transite. Causes asbestosis, mesothelioma.
• Lead (1926.62) — old paint, solder, flashing. Causes neuro/kidney damage. PEL = 50 µg/m³.

Advanced / Pro-Level

Compliance specifics:

• Silica Table 1 lists tasks with specified controls (wet cutting, vacuum dust collection, respirators) — follow Table 1 and you're deemed compliant without air monitoring; deviate and you must do exposure assessment. Never dry-cut concrete/masonry without controls.
• Asbestos work is divided into Classes I–IV; disturbance requires licensed/accredited abatement, negative-pressure enclosures, wet methods, and clearance air sampling. Presume asbestos in suspect materials of pre-1980 buildings (PACM) until tested.
• Lead triggers the RRP Rule (EPA) for pre-1978 housing renovation — certified renovator, containment, HEPA cleanup, no open-flame/dry-sanding.
• All three need medical surveillance, hygiene (no eating in the area), and proper waste handling above action levels.

Practice Challenge

A crew needs to saw-cut a concrete slab indoors. What's the simplest compliant approach under the silica rule, and what must they never do? (Answer: use a Table 1 control — a saw with integrated water (wet cutting) or vacuum dust collection plus the listed respirator — and never dry-cut without controls, which throws respirable silica far above the PEL.)

In Practice

Dry-cutting block all day fills the air with silica dust you can barely see — and years later it's lung disease. Wet-cut and wear a respirator; the damage is invisible until it isn't.

Common Mistakes to Avoid

• Dry-cutting masonry/concrete without dust controls
• Disturbing suspected asbestos or lead in older buildings
• Skipping the respirator because 'it's just dust'

Takeaway: Control silica with water and respirators; assume older buildings may have asbestos and lead, and follow survey/abatement and lead-safe (RRP) rules.

⚠️ Educational overview — NOT official OSHA certification. Get formal training from an authorized trainer and follow current OSHA standards (29 CFR 1926) and your employer's program.