Loose-fill insulation includes fibers or fiber pellets blown into building cavities using specialized equipment. Although it can generally costs more than batt insulation, it usually fills voids and spaces easier and reduces air leakage better while providing better sound damping properties than batt-type insulation.

Cellulose fiber, typically made from recycled newspapers, is chemically treated to resist fire and moisture. Usually installed in walls, floors or attics using a dry-pack process or a moist-spray technique it often provides better R-Value per inch than a fiberglass-based product.

Fiberglass and rock wool loose-fill insulation provide full coverage with a "Blow-in Blanket System" which typically involves blowing insulation into open stud cavities behind an applied netting. Loose-fill insulation has approximately R-3 to R-4 value per inch and cellulose fiber has approximately 30% more insulating value than fiberglass-based loose-fill for the same number of inches installed in a space.

Better Performance With Less Bulk

On average, blown in cellulose insulation is 2-3 inches thinner than fiberglass insulation when both have the same R values. Blown in cellulose insulation and fiberglass insulation both perform well to insulate buildings. However, the performance of the insulation varies greatly depending on the quality of the installation workmanship. This is typically more true for cellulose insulation than fiberglass insulation.

Also in some conditions cellulose-based insulation can cause corrosion on any metal that it touches. But, while fiberglass insulation may not cause corrosion it doesn't insulate the entire cavity of the wall or flow around wall studs as effectively as cellulose can.

Since blown in cellulose insulation is treated for fire resistance, if a fire occurs the blown in cellulose insulation treated with fire retardants, can effectively slow the spread of the fire. Scientists at the National Research Council of Canada have reported that blown in cellulose insulation can increase fire resistance by 22%-55%, and when Blown in Cellulose insulation does burn, it doesn't generally emit toxic chemicals.

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