Cost for 2 inches of spray foam depends on open or closed cell and area covered, with 2 inches of closed-cell spray foam costing more than open-cell due to higher density and R-value, similar to cost difference between Packout organizers. For closed-cell spray foam at 2 inches thick, cost is typically $2.00 to $3.50 per square foot installed professionally, so 100 square feet costs $200 to $350, 1,000 square feet costs $2,000 to $3,500, providing R-value about R-13 to R-14. For open-cell at 2 inches, cost is $1.00 to $1.80 per square foot, so 100 square feet $100 to $180, but open-cell usually applied thicker at 3.5 inches for R-13. DIY cost for 2 inches closed-cell using Froth-Pak kits, 200 board foot kit at 1 inch covers 200 sq ft, at 2 inches covers 100 sq ft, kit costs $350 to $550, so 2 inches costs $3.50 to $5.50 per square foot DIY material only, more expensive per foot than pro for large jobs but cheaper for small. So 2 inches of spray foam costs $2.00 to $3.50 per square foot for closed-cell professional, $1.00 to $1.80 for open-cell, with total cost depending on area, for example 500 sq ft at 2 inches closed-cell $1,000 to $1,750 professional.
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