What is an essential feature of effective air barrier systems?

An essential feature of effective air barrier systems is their resistance to weather and moisture. This characteristic is crucial because air barrier systems are designed to control air leakage, which plays a significant role in maintaining the energy efficiency and comfort of a building. If an air barrier is susceptible to weather and moisture, it can degrade over time, leading to issues such as mold growth, structural damage, and increased energy costs due to unregulated air flow. A durable air barrier system that can withstand environmental challenges ensures the longevity and performance of the building envelope, ultimately contributing to a more energy-efficient and comfortable indoor environment.

While flexibility in installation, aesthetic appeal, and cost-effectiveness have their importance in the selection and application of air barriers, they do not directly relate to the primary function of preventing unwanted air and moisture infiltration, making the resistance to weather and moisture a more critical feature.