Why is air sealing important?
“Reducing the amount of air that leaks in and out of your home is a cost-effective way to cut heating and cooling costs, improve durability, increase comfort, and create a healthier indoor environment.
Air leakage occurs when outside air enters the home and conditioned air leaves your house uncontrollably through cracks and openings. During cold or windy weather, too much air may enter the house. When it's warmer and less windy, not enough air may enter, which can result in poor indoor air quality. Air leakage also contributes to moisture problems that can affect occupants’ health and the structure’s durability. An added benefit is that sealing cracks and openings reduces drafts and cold spots, improving comfort.” U.S.Department of Energy, Energy.Gov
This attic was insulated but not properly air sealed and ventilated, causing mold growth on the roof sheathing.