Spray Foam Insulation cost is typically calculated by the board foot, which is measured like this: 1 foot wide times 1 foot long times 1″ thick.
To calculate the board footage of the space you want to spray, multiply the area you want to insulate by the depth in inches.
Closed-cell Spray Foam is generally $ 1.00 to $1.20 per board foot.
Open-cell Spray Foam is generally $0.25 to $0.30 per board foot.
For example,
2,500 sq ft, At 2″ thick of closed cell = $5000 to $6000
2,500 sq ft, At 4″ thick of open cell = $2500 to $3000
brand we most used is natural polymers where closed cell got a R-value of 7.2 and open celll got a R-value of 3.7 there is a specific R-value required by region, it may change slightly by city as well, that’s why it is a good idea to consult with them before schedulling a visit
for new construction, code is R60 for ceiling and R30 for walls, which translates do 4.25 inches and 8.25 inches that means walls got be 2×6 and rafters at least 2×10
