Fact: All loose-fill insulation products can settle over time. By federal law and industry standards compensation for settlement is built into cellulose insulation coverage charts. When installed properly in accordance with the coverage chart, loose-fill cellulose insulation will not settle below the intended R-Value. When Nu-Wool Premium Cellulose Insulation is properly installed in wall cavities to a density of 3.0 to 3.5 pounds per cubic foot using the Nu-Wool WALLSEAL System, it adheres to the studs, plates and sheathing, and will not settle.