All spray foams contain millions of microscopic bubbles in their composition. With open cell foam these bubbles are filled with air. This results in foam that is softer and less dense than closed cell foam and also delivers a lower R-value per inch. Our open cell spray foam has an R-value of 3.9 per inch. Open cell foam is a very effective air barrier, has exceptional acoustic properties and offers the customer significant energy savings. Open cell foam has other benefits such as its high expansion rate which in some instances makes it superior to closed cell foam such as in areas where there are framing cavities that are mostly closed off and not accessible. The high expansion rate allows us to inject the foam into the cavity and completely fill it with foam which seals it off from all air leakage; this would not be possible in many instances with closed cell spray foam. One of the drawbacks to open cell spray foam insulation is that when properly installed in exterior walls it generates waste that ends up in the landfill. While this is of course a concern for the environment, the reduction in energy consumption resulting from the use of spray foam to insulate your new home outweighs the disposition of the waste it creates. This of course is not true when it is used in ceilings as significant R-value is attained without the need to trim the insulation. Open cell spray foam is primarily a residential or sound proofing product. It is seldom used on steel as it does not adhere as well as closed cell foam and should NEVER be used in applications below grade as it does absolutely nothing to stop the penetration of moisture.