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 ...

Rigid foam insulation consists of panels sold in 4-by-8-foot sheets in thicknesses from 1/4 to 2 inches. It is also sold in large bundled panels, joined at the ends in accordion style, for use as ...

The average cost of foam board insulation is between $2.40 and $3.75 per square foot. Spray Foam Spray foam insulation, like blown-in, is great for adding insulation to existing finished areas and ...

Closed-cell spray foam is more expensive, costing between $1 and $1.50 per board foot. Do keep in mind that closed-cell spray foam insulation is a better insulator per board foot than open cell.

Cons: Foam board insulation can be harder to install snugly in unusually shaped spaces, leaving gaps for air to flow. To create an effective air and moisture seal, you need to tape all seams ...

Rigid foam insulation gets a climate chemistry upgrade ... the low-GWP XPS foam boards are currently around 15% more expensive than HFC-blown boards at hardware stores.