Closed Cell Foam is a strong and rigid spray insulation solution containing small pockets of gas that makes it very difficult for hot air or cold air to pass through it.

It has a higher insulating value than open cell foam and creating a resistant barrier against water, vapor and the elements.

Due to the cell structure of closed cell foam; they have a low vapor permeance and may be considered a vapor retarder depending on the thickness and is used in exterior spray foam insulation applications.