What is the difference between open and closed cell foam?
Open and closed cell are the terms used to differentiate between the two most common types of spray polyurethane foam. Open Cell is a low-density foam filled with tiny cells that are not completely closed. Air fills all the open space within the foam. When sprayed, it expands to up to 150 times the volume of its liquid state. Open Cell foam feels and looks like a sponge when it’s applied. It is an excellent insulator and sound proofing material. Open Cell typically has an R-value of 3.5. Closed Cell Foam is a medium density product that’s filled with tiny closed cells filled with gas that give the cells their size and density. Closed cell foam is generally rigid and it’s hydrophobic (repels water). It is an excellent insulator; as well as, an excellent air, thermal and vapor barrier. Closed cell can also increase the structural integrity of your home. Closed Cell Foam has R-values ranging from R-6 to R-6.5.
