What does air sealing around fenestration primarily prevent?

Air sealing around fenestration, which includes windows and doors, primarily functions to prevent water and air infiltration. This sealing is crucial because gaps and cracks around these openings can allow outside air to enter the building, leading to drafts and discomfort for occupants. Additionally, air infiltration can contribute to increased energy consumption as heating and cooling systems work harder to maintain desired indoor temperatures.

Preventing water infiltration is equally important; leaks can lead not only to possible damage to building materials but also to mold growth and other moisture-related issues, which can affect indoor air quality and structural integrity over time. By ensuring a tight seal around these openings, buildings can maintain better overall energy efficiency while improving comfort and safety.

While minimizing noise intrusion, heat loss, and dust accumulation may also be benefits of proper sealing, the fundamental purpose of air sealing specifically targets the issues caused by uncontrolled air and water entering or exiting the structure.