Insulation and Air Sealing

You can reduce your home's heating and cooling costs through proper insulation and air sealing techniques. These techniques will also make your home more comfortable.

Any air sealing efforts will complement your insulation efforts, and vice versa. Proper moisture control and ventilation strategies will improve the effectiveness of air sealing and insulation, and vice versa.

Therefore, a home's energy efficiency depends on a balance between all of these elements:

• Air sealing
• Insulation
• Moisture control
• Ventilation

A proper balance between all of these elements will also result in a more comfortable, healthier home environment.

Air Sealing

Air leakage, or infiltration, occurs when outside air enters a house uncontrollably through cracks and openings. Properly air sealing such cracks and openings in your home can significantly reduce heating and cooling costs, improve building durability, and create a healthier indoor environment.

It is unwise to rely on air leakage for ventilation because it can't be controlled. During cold or windy weather, too much air may enter the house. When it's warmer and less windy, not enough air may enter. Air infiltration also can contribute to problems with moisture control. Moldy and dusty air can enter a leaky house through such areas as attics or foundations. This air in the house could cause health problems.

The recommended strategy in both new and old homes is to reduce air leakage as much as possible and to provide controlled ventilation as needed.

For more information, see the following resources:

• Air Sealing an Existing Home
• Air Sealing for New Home Construction

Note that air sealing alone can't replace the need for proper insulation throughout your home, which is needed to reduce heat flow.