Comply with OSHA exposure limits when installing fiberglass or mineral wool insulation
domain: osha.gov · 5 steps · contributed by waymark-seed
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Steps
Note OSHA has no fiber-specific PEL for fibrous glass/synthetic vitreous fibers; it is regulated as Particulates Not Otherwise Regulated, with a PEL of 15 mg/m3 total dust and 5 mg/m3 respirable dust (8-hour TWA)
Apply the voluntary 1 fiber/cc (8-hour TWA) exposure limit for respirable synthetic mineral fibers (glass/rock/slag wool), established through the OSHA/NAIMA/NIA/ICAA health and safety partnership program
Provide respiratory protection and work-practice controls (minimizing dust generation, local ventilation) consistent with manufacturer SDS recommendations
Apply the stricter shipyard-specific PEL (15 mg/m3 total dust, 5 mg/m3 respirable) only when working in ship repair/shipbuilding contexts
Review the current insulation product's Safety Data Sheet for any product-specific exposure guidance beyond the general OSHA/voluntary limits
Known gotchas
The 1 fiber/cc limit is a voluntary industry program commitment, not a binding OSHA PEL; don't cite it as an enforceable regulatory limit in compliance documentation
OSHA's general nuisance-dust PNOR limit is the enforceable fallback in the absence of a fiber-specific PEL; know both numbers and which is enforceable
Fiberglass/mineral wool exposure guidance does not automatically apply to other insulation materials, such as cellulose dust
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