Air leakage can account for 30-40 percent of home heat loss, Reducing this major source of heat loss is the first and most critical step in building an energy efficient house. In addition, performance of other energy efficiency measures, such as better insulated walls and high performance windows, is degraded when air leaks around or through them. Air sealing makes a tighter, quieter, more comfortable home. Better quality construction is the result of carefully sealing all joints and penetrations. This eliminates uncomfortable drafts, promotes more even heating and cooling, and reduces outside noise.
Air sealing improves indoor air quality.
Sealing joints and penetrations prevents infiltration of outdoor air pollutants and dust as well as reducing the potential for insect infestation. Air-tight construction also reduces moisture infiltration from humid outdoor air in humid weather. Preventing air leakage means more than installing an air-infiltration barrier and using 40 tubes of caulk. The key to an efficient, high quality sealing job is to identify air leakage paths, determine the most effective sealing methods, and plan ahead for materials, timing, and responsibilities. Attention to several construction details can help ensure reduced infiltration and increased comfort.