What's the Advantage of Using Closed Cell Soy Insulation?

The advantages of closed cell foam compared to open cell foam include its strength, higher R-value, and its greater resistance to the leakage of air or water vapor. The disadvantage of the closed cell foam is that it is denser, requires more material, and therefore, is more expensive. Even though it has a better R-value, typically the cost per R is still higher than open cell foam. The choice of foam can also be based on the requirements for the other performance or application specific characteristics such as strength, vapor control, available space, etc.  Open cell SPF has an R-value around 3.5 per inch and typically uses water as the blowing agent.  Closed cell SPF has an R-value of around 6.0 per inch (aged R-value) and uses high R-value blowing agents.