Spray foam pricing in the Chattanooga area depends on three things: which type of foam (open or closed cell), how thick it's applied, and how accessible the area is. Most projects fall between $1.50 and $4.50 per board foot installed.
Open vs Closed Cell Pricing
Open cell foam runs roughly $1.00–$2.00 per board foot. It expands more, so it covers larger cavities at a lower cost.
Closed cell foam typically runs $1.75–$4.50 per board foot. You pay more, but you get higher R-value, a vapor barrier, and added structural strength.
Typical Project Ranges
Attic spray foam (1,500 sq ft home): $3,500–$7,500.
Crawl space rim joist + walls: $2,000–$5,500.
Metal building (30x40 shop): $6,000–$12,000.
What Drives the Price
Access matters. A walkable attic with full headroom prices very differently than a low crawl space. Removal of old, damaged insulation is also a separate line item. Get a written quote — not a phone estimate — for any project over a few thousand dollars.