Closed-cell spray polyurethane foam (SPF) is one of the most advanced insulation solutions available. The dense polyurethane foam insulation is extremely durable, expanding and fully adhering to surfaces, strengthening the structure of a home. It provides incredible thermal performance and can be installed in areas that would be inaccessible or difficult for other forms of insulation. It effectively isolates air currents and moisture, reducing the chance of mold or mildew and increasing the life of a home.