Open-Cell Spray Foam: Complete Buying Guide 2026
Open-cell spray foam expands to fill cavities completely, creating an effective air seal. It is softer and less expensive than closed-cell foam, making it ideal for interior applications and sound dampening. In 2026, open-cell spray foam prices average $0.65 per sq ft (per inch), with a typical range of $0.40 to $1.00 depending on your region, supplier relationships, and order quantity.
When budgeting for a project using open-cell spray foam, factor in approximately 3% additional material for waste, plus labor costs averaging $0.50 per sq ft (per inch) for professional installation. A typical project using this material runs approximately $3,200 including both materials and labor.
With an expected lifespan of 80 years, open-cell spray foam represents a cost of approximately $0.01 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.