
Wet cellulose insulation works best for new construction. Wet-spray or damp-spray insulation is loose-fill cellulose, fire retardant, water, and adhesive sprayed into wall cavities before covering with drywall. Wet cellulose insulation costs $0.60 to $2.00 per square foot, including installation. Some experts recommend against cellulose insulation in fire-prone regions because the core material is still highly flammable even though it is treated with fire retardants.Cellulose's settling characteristic is beneficial in colder climates because it creates a denser, more effective thermal barrier than fluffier, loose-fill fiberglass.


The insulation type, number of walls, and whether the insulation is installed from the interior or exterior impact the total.
