What is the difference between an open-cell foam versus a closed-cell foam? The open-cell foam has tiny cells that are not completely closed (thus the name "open" cell). This allows air to fill up the open spaces inside the material, making the foam weaker and softer to the touch.
Closed-cell foam, on the other hand, is made up of cells completely closed and packed together. They are filled with a gas that forces the foam to rise and expand which makes it a greater insulator.
Closed-cell foam has a greater R value, is stronger and it has a better resistance to the leakage of air and water vapor. The higher the density the foam, the heavier, or stronger it becomes.
Washington Roofing & Insulation uses BASF Closed Cell Spray Foam that provides an R-value of 6.7 per inch and has a density of 2.0 pounds per cubic foot. For more information, visit our website or contact us at 800.383.3062