Air Sealing & Weatherization
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 and conditioned air leaves your house uncontrollably through cracks and openings. It is unwise to rely on air leakage for ventilation. 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.
The recommended strategy is to reduce air leakage as much as possible and to provide controlled ventilation as needed. Before air sealing, you should first:
- Detect air leaks
- Assess your ventilation needs for indoor air quality
- You can then apply air sealing techniques and materials, includingspray foam, rigid foam board, caulking and weather-strips
Consider a home energy audit to identify all the ways your home wastes energy and money.
Note that air sealing alone doesn’t eliminate the need for proper insulation to reduce heat flow through the building envelope.