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Fiberglass consists of extremely fine glass fibers and is one of the most commonly used insulation materials. It's used in two different insulation forms: blanket (batts and rolls) and loose-fill.
Manufacturers now produce medium and high density fiberglass batt insulation products that have slightly higher R-values than previous varieties. The denser products are intended for insulating areas with limited cavity space, such as cathedral ceilings. High-density fiberglass batts for a 2 x 4 inch (51 x 102 millimeter) stud-framed wall has an R-15 value, compared to R-11 for "low density" types. A medium-density batt offers R-13 for the same space. High-density batts for a 2 x 6 inch (51 x 152 mm) frame wall offer R-21. High-density batts for an 8.5 inch (216 mm) spaces offer about an R-30 value. R-38 for 12 inch (304 mm) spaces is also available.
Fiberglass loose-fill insulation is made from molten glass that is spun or blown into fibers. Most manufacturers use 20%-30% recycled glass content. Loose-fill insulation must be applied using an insulation blowing machine; it is designed for open-blow applications (such as attic spaces) or closed-cavity applications (such as those found inside walls or covered attic floors).
