After 24 hours, fully cured closed-cell foam is inert. After 4 hours per lift, you can enter without respiratory protection. Local contractors provide written re-entry guidance based on the specific products used.
More detail
Re-entry timeline depends on the specific product and ambient conditions. Standard closed-cell guidance: 4 hours after final lift before entering the work area without respiratory protection, 24 hours before sleeping in foamed rooms, 48 hours before strenuous use. Open-cell typically cures faster: 2 hours and 12 hours respectively. Pets: arrange off-site care for the install day plus 24 hours after; cats and small dogs are more sensitive to the curing odor than humans. Pregnant occupants and infants under 1: industry guidance recommends staying out of the home for 48-72 hours post-install as a precaution; this is not based on documented harm but on the principle of minimizing exposure during sensitive developmental windows. Asthmatic or chemically-sensitive occupants: discuss with the local installer at quote time; a longer ventilation cycle (24-48 hours of HVAC running with windows open) typically eliminates residual odor concerns. Cincinnati sensitivity-planning context: pregnant occupants and infants under 1 year are typically advised to vacate for 48-72 hours post-install as a precaution; this is not based on documented harm but on minimizing exposure during sensitive developmental windows. Asthmatic occupants should request a longer ventilation cycle (24-48 hours of HVAC running with windows open) which eliminates residual odor concerns reliably.