Spray foam insulation is a type of insulation that is sprayed onto walls, floors, ceilings, foundations and other parts of a building structure. It comes as a liquid and expands after application to form a seamless air barrier and thermal insulation. There are two main types of spray foam insulation - open-cell and closed-cell. https://articlescad.com/the-benefits-of-using-spray-foam-insulation-in-homes-14785.html