Spray foam Sprayed polyurethane foam (SPF) is used in many applications and is one of the fastest growing foam markets. SPF is mainly used for insulation in the construction and roofing industries, the aerospace industry, as pipeline insulation, and in hot tubs and spas. Because of its superior thermal properties, SPF is among the leading insulating materials used for these applications. Additional benefits of SPF include barriers to air, moisture, and dust, reducing heating and cooling costs, providing a seamless structure, and improving structural support. SPF can also be used as an adhesive in roofing, adding an additional layer of insulation while adhering boardstock insulation to the roof.