Cellulose Part 2 - Air Infiltration

Uncontrolled leakage of air through exterior walls and ceilings of homes is almost as important as R-Value in determining how much energy will be required to heat and cool a building. Infiltration of unconditioned air means that heating and cooling systems must expend more energy to compensate for the infiltration.

When dense-packing the walls (a later topic) of a home, "nooks and crannies" that leaked air in the past are sealed off from the exterior. The same holds true in an attic. Due to the fact that cellulose relies on density (bag count) versus height and air, less air penetration occurs through the ceiling joists and surrounding bypasses. Even if small amounts of air sealing are missed, cellulose will aid in compensating for the areas not covered.

Once again, The Energy Guy recommends cellulose for existing walls and attics - not only for the R-value, but for the air sealing capabilities.

Next Topic: Cellulose Part 3 - Health and Safety