Unfortunately, insulation is not something that is easily changed once a home is built. You only have one chance to make the right decision. The Icynene Insulation System® represents the latest advancement in insulation technology. There is no other system available which offers so much to the new home builder and buyer. Icynene is a soft foam insulation that is sprayed in place and expands 100 times in volume to completely insulate and air-seal your home in a single application.