How does the building envelope contribute to moisture control?

The building envelope plays a critical role in moisture control by acting as a barrier against external moisture. This barrier is essential for preventing water from infiltrating the interior spaces of a building, which can lead to mold growth, decay, and a host of other moisture-related issues. A well-designed building envelope typically includes materials and techniques that protect against rain, snow, and humidity while also facilitating drainage and controlling the movement of water vapor.

In contrast, while enhancing aesthetic appeal and providing structural support are important functions of the building envelope, they do not directly address the moisture control aspect. Allowing for air exchange with the outdoors is also necessary for ventilation but can potentially introduce external moisture if not properly managed. Therefore, the primary function relevant to moisture control is the envelope's role as a moisture barrier.