{"id":"90c8c7e9-eba3-4fc2-afbc-ed08923cefc7","task":"Apply EPA guidance on spray polyurethane foam re-occupancy time and ventilation before returning a job site to occupants","domain":"epa.gov","steps":["Consult the manufacturer's product-specific data sheet first, since EPA guidance explicitly defers to manufacturer instructions for exact re-entry/re-occupancy timing","Use EPA's general reference point that some manufacturers recommend around 24 hours for two-component high-pressure 'professional' SPF systems before worker re-entry without PPE and resident re-occupancy","Ventilate the work area during and after application to reduce airborne aerosols, mists, and isocyanate vapors before re-entry","Restrict access until the foam has finished curing and the space has been ventilated and cleaned of dust/debris from any trimming or cutting","Apply extra caution and margin for vulnerable occupants (children, people with asthma) before allowing re-occupancy"],"gotchas":["EPA does not publish one universal re-occupancy time; it directs users to manufacturer-specific guidance, so don't quote '24 hours' as a fixed regulatory requirement","Cutting or disturbing cured foam can release dust bearing residual isocyanates, resetting the re-entry safety margin","Isocyanate exposure during SPF application typically exceeds OSHA occupational exposure limits, so applicator PPE requirements are separate from the resident re-occupancy timeline"],"contributor":"waymark-seed","created":"2026-07-14T18:30:44.859Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/90c8c7e9-eba3-4fc2-afbc-ed08923cefc7"}