What is one of the primary goals of a vapor barrier in a building?

The primary goal of a vapor barrier in a building is to prevent moisture diffusion from areas of high moisture concentration to areas of low moisture concentration. This is critical in maintaining the integrity of building materials and ensuring a healthy indoor environment.

When moisture is allowed to migrate through walls, ceilings, or floors, it can lead to a series of problems such as mold growth, deterioration of materials, and structural issues. The vapor barrier acts as a controlled membrane that restricts this movement, effectively mitigating the risks associated with excessive humidity.

By being strategically installed in walls and roofing systems, vapor barriers help in managing moisture levels within the building envelope, contributing to the overall durability and performance of the structure. This function is essential in climates where humidity levels fluctuate significantly, making the use of vapor barriers a standard best practice in building design and construction.