Cellulose Insulation
Alias(s): Blown in Insulation
R-value per inch: Approx - 3.5
Weaknesses: Does not prevent radiant heat transfer (The primary source of heatflow in and out of your structure). Problems can occur relating to the distribution of the cellulose. In time it can be difficult to maintain an even distribution of the cellulose. A typical problem is that the insulation slides down from the center peak of house towards the edges. You're left with little or no insulation along middle of house ceiling. Not very air tight, air can flow through the insulation especially when coverage is light. Fibers can cause indoor air quality problems (rare). Good nesting material for rodents. Once wet it is permanently damaged. It does not dry quickly. Metal corrosion problems have been attributed to boric acid (fire resistant chemicals) leaching out of wet cellulose.