Reoccupancy time is dependent on a number of factors, including SPF formulation, the amount of foam applied per volume of space, temperature, humidity, the degree of ventilation and other variables. In addition to the release of airborne SPF chemicals during spray application, certain components can be liberated from some newly-installed SPF products for a short period of time following installation. Contact your supplier for guidance on ventilation time and reoccupancy.
Some SPF manufacturers may have had their SPF products tested using the Canadian Standard Laboratory Guide for the Determination of Volatile Organic Compounds from Polyurethane Foam (CAN/ULC S774-06). If so, request from the manufacturer the recommended reoccupancy time for that SPF product. In addition, such information is publicly available in some cases. The Canadian Construction Materials Centre has a searchable Registry of Product Evaluations available that contains product evaluations for many types of building products, including SPF insulation.
Evaluation reports for many types of building products, including SPF insulation, often include the suggested reoccupancy time, which is variable: for an interior application using two component high-pressure SPF, some manufacturers recommend 24 hours before reoccupancy, and for an interior two component, low-pressure SPF kit application, some manufacturers recommend a one hour reoccupancy time. Consult the product manufacturer to determine the recommended reoccupancy time for the particular job and SPF in use.