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Cellulose fiber is produced from paper, which in turn is derived from wood. However the insulation is installed - blown into the attic or damp-sprayed into wall cavities - the material is the same. It comes packed in bags that weigh from 25 to 35 pounds apiece. By weight, about 82% to 85% of the material is cellulose fiber - most of which is reprocessed from old newspaper - with the remainder consisting of chemical fire retardant.
The fire retardants are added in the form of a dry powder. The borate chemicals used - often in combination with ammonium sulfate - also add mold, insect, termite, rodent, and other insect resistant properties designed to prevent infestation throughout the life of the structure.
