Blow-In Fiberglass Insulation

Fiberglass insulation is composed of molten sand and recycled glass spun or blown into coarse fibers. The Owens Corning Company began producing the modern form of fiberglass insulation in 1938. Now fiberglass exists as a pink, white, yellow, green or brown spongy material that traps pockets of air inside walls and other cavities in a structure to block the flow of heat. It is usually comprised of 20-30 percent recycled material, is nonflammable and does not decompose.

Controversy continues about the possible health risks associated with fiberglass insulation, such as skin and lung irritation. Fiberglass insulation is one of the most thoroughly-tested building materials in use today. A 2001 report by the International Agency for Research on Cancer (IARC) stated that fiberglass is not a likely carcinogen. Extensive research has concluded that there is no convincing evidence that exposure to fiberglass is associated with respiratory disease or cancer in people. However, doubts remain and precautions should be taken when disturbing or handling fiberglass.

Loose-Fill Fiberglass Insulation:

Loose-fill fiberglass insulation was created to help eliminate the gaps, voids and compressions created by traditional fiberglass blankets. It is the same material but not formed and cut into standard-size pieces. It is blown into attic, wall and floor cavities with a machine to create a monolithic fill.