Closed-Cell Spray Foam: Complete Buying Guide 2026
Closed-cell spray foam is a high-performance insulation that also acts as an air barrier, vapor barrier, and structural reinforcement. It provides the highest R-value per inch of any common insulation material. In 2026, closed-cell spray foam prices average $1.80 per sq ft (per inch), with a typical range of $1.20 to $2.50 depending on your region, supplier relationships, and order quantity.
When budgeting for a project using closed-cell spray foam, factor in approximately 3% additional material for waste, plus labor costs averaging $1.00 per sq ft (per inch) for professional installation. A typical project using this material runs approximately $5,500 including both materials and labor.
With an expected lifespan of 80 years, closed-cell spray foam represents a cost of approximately $0.02 per sq ft (per inch) per year of service life. This exceptional longevity makes it one of the most cost-effective materials when measured over its full lifespan.