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Sheetrock was literally on the coat tails of the insulation crew so barely had time to snap one picture of the cellulose. Cellulose is a material used as loose-fill insulation, it's made from recycled wood fiber, mostly newsprint. The wood fiber is shredded and pulverized into small, fibrous particles that pack tightly into the stud cavities of the exterior walls, inhibiting airflow for enhanced insulation values. After rough in of electrical, plumbing and mechanical systems, the framed walls have a netting stapled to the studs, and afterwards the cellulose is blown in. It can't escape and fills these cavities very tightly. This combined with the sprayed in Polyurethane is a very efficient system.
