A board foot is 144 cubic inches. With this unit as the standard to go by, open cell spray foam insulation costs between $0.45 and $0.65 per board foot. Closed-cell spray foam is more expensive ...

The average cost of blown-in insulation is between $1.65 and $3.80 per square foot. Foam board, or rigid foam board insulation, is best for insulating the exterior of your home and is installed ...

Foam board insulation is easy to use and a great DIY way to add some insulation. It comes in standard-size 4×8 sheets and smaller sizes, in thicknesses from 1/4-in. to two inches. Some types of ...