All services
52 services in 9 categories · all live now
Board feet, foam type, thickness and prep priced for attics, walls and rim joists.
Common US spray foam jobs at the typical installed rate.
Tap a preset in the calculator above to load a typical job, then adjust the numbers to match your site.
Starting points: 1,000 sq ft at 2 in closed · 1,000 sq ft at 3 in closed · 1,000 sq ft at 2 in open · 500 sq ft at 2 in closed · 2,000 sq ft at 2 in open
Free for blogs and contractor sites. Keep the credit link.
Embed this calculator on your site with the credit link intact.
Measure the area and thickness, choose the foam, then compare per-board-foot bids.
Closed cell runs $1.00 to $2.50 per board foot and open cell $0.50 to $1.40. A 1,000 sq ft attic at 2 inches of closed cell is about $3,200.
One square foot at one inch thick. Multiply area by thickness to get board feet, which is how contractors quote spray foam.
It air seals and insulates in one step, which matters in attics and rim joists. Payback is usually shorter when air sealing is the main problem.
Closed cell for thin cavities, vapour control and higher R per inch. Open cell for cost and sound dampening where thickness is available.
It can trap moisture if applied over wet wood or if the assembly cannot dry. The building must be dry and the design appropriate for the climate.
DIY kits work for rim joists and small areas. Whole-attic spray foam needs professional equipment, PPE and often a permit.
Using the calculator defaults, 1,000 sq ft at 2 in closed gives Board feet: 2,000 and Typical cost: $3,860, with a typical range $2,556 to $6,234. Change the waste allowance, material or thickness to match your site.
Using the calculator defaults, 2,000 sq ft at 2 in open gives Board feet: 4,000 and Typical cost: $5,060, with a typical range $3,212 to $7,848. Change the waste allowance, material or thickness to match your site.