Cellulose — a material used as loose-fill insulation — is made from recycled wood fiber, primarily newsprint. The wood fiber is shredded and pulverized into small, fibrous particles that pack tightly into closed building cavities, inhibiting airflow. This provides a thermal resistance of R-3.6 to R-3.8 per inch.
07 21 26 Blown Insulation
This topic includes information related to blown insulation installed during construction. Blown insulation is commonly installed in between studs, joists and rafters. Blown insulation materials include; cellulose, fiberglass and mineral wool.