What's the difference?

The Basics

The Cells: A spray insulation is referred to open cell or closed cell because of the difference between the small bubbles (cells) that make up the foam.
Open Cell: This type of foam is full of cells that are not completely enclose. Hence the name, the cells are left open on purpose in order to make the foam softer and more flexible.
Closed cell: This type of foam is made of up of cells, as the name suggests, are completely closed. The cells are very close and pressed up together so that the air and moisture can not get inside. Due to these factors, closed cell foam is much more rigid and more stable.

Density

Closed cell foam is much more dense than open cell foam. If you are number person, here is the difference:
-Open cell has a density of ~.5 pounds per cubic foot
-Closed cell has a density of ~ 1.75 pounds per cubic foot

R- Value

All foams have a very important value called a R-value. This term refers to the heat resistance or heat flow (how well can they insulted).
Generally, closed cell foam as a higher R-value because the cells are so close and do not allow a lot outside factors in and out.
Benefits of Closed Cell Foam
•Acts as vapor barite so that waster moisture will be less likely to get inside of the home or the business.
•Great for locations where space is an issue
Benefits of Open Cell Foam
•Expand so much faster once it has been applied, meaning is can insulate hard to reach places.
•Less expensive than closed cell foam but is not ideal for locations with extreme weather temperatures.