energytips

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.

Air Sealing an Existing Home
Air sealing is one of the most significant energy efficiency improvements you can make to your home. Air sealing will not just reduce energy costs; it will also improve your home's comfort and durability.

Before air sealing, you should first do the following:
Detect air leaks and assess your ventilation needs for indoor air quality

You can then apply air sealing techniques and materials as needed, including caulk and weatherstripping.
If you're completely remodeling your home, which will include some construction, also review some of the techniques used for air sealing in new home construction.

Air Sealing for New Home Construction
Air sealing is an important factor when constructing an energy-efficient home. These are some air sealing techniques and materials: Air barriers, Caulking and Weatherstripping

Before developing an air sealing strategy, you should also consider the interaction between any air sealing materials and techniques with other building components, including the following:
Insulation, Moisture and Ventilation

This is called the whole-house systems approach.

Note that air sealing alone can't replace the need for proper insulation.