Closed-Cell Polyurethane Foam insulation is highly dense and, when sprayed, expands up to 30 times its original size producing an R-value per inch of 7.4. In Closed-Cell spray foam, Cells or bubbles in the foam are compacted together, are not broken, and each is filled with an inert gas selected to make the insulation value of the foam as high as possible. An example of Closed-Cell foam insulation that we benefit from every day would be the insulation found in your refrigerator and freezer.
The advantages of Closed-Cell foam include its strength, higher R-value, and greater resistance to the leakage of air or water vapor, making it ideal for windy, damp, and water prone locations, such as coastal areas, below grade, crawlspaces, or for the whole house. For many of our clients, Closed-Cell foam is the product of choice. While more expensive than Open-Cell foam because of its density, at the 1-inch thickness, Closed-Cell foam develops the all-important air barrier and at 2” a vapor barrier.