Spray-on Fiberglass

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.