Blown Insulation is the better choice for attic insulation. The installer uses a hose that is connected to a large machine that blows smaller chuncks of insulation through the hose. As the insulation is sprayed out of the hose, the installer is directing the insulation to all of the attics' floor. He is making sure to cover all of the gaps that are formed during the construction process. There are two choices when it comes to blown insulation, fiberglass and cellulose. Each has pros and cons. They both insulate about the same with R values in the 3 to 4 inch range. Cellulose fiberglass is manufatured by recyling old newspapers and fiberglass is made from sand. You may be asking, "why use blown insulation"? The answer is simple, blown insulation helps insulate both small and large openings in the attics' space.
Spray foam insulation is an alternative to more commonly used insulation such as fiberglass and batts. When the installer sprays the foam into roof tiles, sub floors, and wall cavities, what is really happening is that a two part component mixture made from isocyanate and polyol resin comes together at the tip of the gun. When this mixture comes together, a reaction starts that creates a expanding foam. The foam continues to expand filling small holes and creaveses
Why fiberglass? Fiberglass is a type of fiber compossed of mostly glass and is used in a wide variety of applications. Fiberglass is the leader in home and commerical thermal insulation. Since fiberglass is an insulator it slows the spread of heat, cold and sound in inclosed spaces. When you use fiberglass insulation in your home you are effectievly trapping air in your home, this is a convenient way to make your home more energy efficient. Fiberglass is an attractive option because it poses no fire hazzard. According to some estimates, fiberglass insulation can save you up to 40% of energy loss from your home.