As discussed in Chap. 7, fiberglass is one of a group of glassy, noncrystalline materials historically referred to as man-made mineral fibers (MMMFs) or man-made vitreous fibers (MMVFs). The fiber is made from molten sand, glass, or other inorganic materials under highly controlled conditions. After the glass is melted in a high – temperature gas or electric furnace, the material is spun or blown into fibers that are then processed into the final product. The base material for spray-on fiberglass is fiberglass loose-fill insulation. Inorganic and noncombustible, the fibers will not rot or absorb significant amounts of moisture. Fiberglass does not support the growth of mildew, mold, or fungus.
The terminology used in the spray-on fiberglass industry can be overlapping in discipline and at times confusing. Applying wet – spray fiberglass is similar to applying sprayed-on fireproofing. The material typically is left exposed and is suited for commercial projects or, on rare occasions, high-end residential projects. There are two predominant methods of spraying fiberglass loose-fill in residential construction. The most common method is proprietarily known as the Blow-In-Blanket System (BIBS). A second method, known as dimensionally stable fiberglass, uses loose-fill insulation applied in a manner similar to stabilized cellulose insulation and is discussed later in this chapter.