Which performance aspect is most crucial for air barriers in humid climates?

In humid climates, minimizing water infiltration is critical for air barriers due to the significant challenges posed by moisture. Air barriers are designed to control air movement and reduce the potential for moisture-related problems, such as mold growth, structural damage, and degradation of insulation materials. In such environments, the introduction of moisture from the outside can compromise the effectiveness of the air barrier and lead to detrimental effects on the building envelope.

Efficient air barriers must effectively seal against both air and moisture intrusion to maintain indoor air quality and protect the integrity of the building's materials. By preventing water infiltration, air barriers help maintain a balanced humidity level within the building, which is essential for occupant comfort and sustainability. Therefore, the role of an air barrier in reducing water infiltration becomes paramount to ensure the longevity and performance of a structure in humid climates.