Spray Foam Insulation: frequently asked questions
These answers are general. For your situation, check the official sources listed below or ask a professional.
Open or closed cell?
Open cell is lighter, cheaper per inch and air-seals well; closed cell has a higher R-value per inch and resists moisture. The installer recommends one by location.
Do I need to leave the house?
Usually during application and curing, as specified by the manufacturer.
Is a permit needed?
Sometimes; codes also require barriers over foam in some locations.