Cellulose insulation, when installed at proper densities, cannot settle in a building cavity.Ĭellulose insulation is used in both new and existing homes, as loose-fill in open attic installations and dense packed in building cavities such as walls and cathedral ceilings. Manufacturers add the mineral borate, sometimes blended with the less costly ammonium sulfate, to ensure fire and insect resistance. The paper is first reduced to small pieces and then fiberized, creating a product that packs tightly into building cavities. The newer BIBS HP is an economical hybrid system that combines BIBS with spray polyurethane foam.Ĭellulose insulation is made from recycled paper products, primarily newsprint, and has a very high recycled material content, generally 82% to 85%. BIBS is blown in dry, and tests have shown that walls insulated with a BIBS system are significantly better filled than those insulated using other forms of fiberglass insulation such as batts because of the effective coverage obtained by this method of application. One variation of fiberglass loose-fill insulation is the Blow-In-Blanket System® (BIBS). Loose-fill insulation must be applied using an insulation-blowing machine in either open-blow applications (such as attic spaces) or closed-cavity applications (such as those found inside existing walls or covered attic floors). Most manufacturers use up tp 40% to 60% recycled glass content.
R-38 batts for 12-inch (304-mm) spaces are also available.įiberglass insulation is made from molten glass that is spun or blown into fibers. High-density batts for a 2 by 6-inch (51 by 152 mm) frame wall offer R-21, and high-density batts for an 8.5-inch (216-mm) spaces yield about an R-30 value. A medium-density batt offers R-13 for the same thickness. High-density fiberglass batts for a 2 by 4-inch (51 by 102 millimeter ) stud-framed wall has an R-15 value, compared to R-11 for "low density" types. The denser products are intended for insulating areas with limited cavity space, such as cathedral ceilings. Manufacturers now produce medium- and high-density fiberglass batt insulation products that have slightly higher R-values than the standard batts. It's commonly used in many different forms of insulation: blanket (batts and rolls), loose-fill, and is also available as rigid boards and duct insulation. Fiberglass consists of extremely fine glass fibers and is one of the most ubiquitous insulation materials.
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