Fiberglass Batts and Rolls

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 cur­rent terminology is synthetic vitreous fibers (SVFs). The synthetic fiber is made from molten sand, glass, or other inorganic materials under highly controlled conditions. After the glass is melted in high-temperature gas or electric furnaces, the material is spun or blown into fibers that are then processed into the final product. Batt insulation is glass that is spun into threads, coated with a

binding agent, and collected into a thick matte of fibers of varying thicknesses. Perhaps the most common of all residential insulation materials, it is estimated that since the development of fiberglass insulation in the 1910s, it has been used in approximately 90 per­cent of homes in the United States (that contain insulation).1