Closed Cell Spray Foam

Closed cell is denser which prevents moisture from entering the insulation and has a higher R-value than open cell foam.

Open Cell Foam

Open cell is less dense than closed cell but less is needed as it expands substantially. It has a lower R-value but is a great sound insulator compared to closed cell foam.

What is R-Value?

According to consumer.ftc.gov, R-value means resistance to heat flow. The higher the R-value, the greater the insulating power. One of the biggest factors in maintaining the R-value is the way the insulation is installed.