What is the primary cause of moisture-related issues in building assemblies?

The primary cause of moisture-related issues in building assemblies is air leakage. This phenomenon occurs when air moves in and out of a building through unintentional openings or cracks in the building envelope. When outside air enters a structure, it can bring in moisture that condenses on cooler surfaces, leading to a range of issues such as mold growth, wood decay, and damage to insulation and other materials.

Air leakage not only allows moisture to enter but also can impact the overall climate control within a building, exacerbating the potential for condensation and increasing the demand on heating and cooling systems. By understanding that air leakage plays a crucial role in moisture management, building professionals can implement effective sealing and insulation strategies to mitigate these issues, ensuring a more durable and healthy indoor environment.

While other factors like water stagnation, soil moisture, and temperature fluctuations can also contribute to moisture problems, air leakage is considered the primary mechanism that allows exterior moisture to infiltrate and negatively affect building assemblies.