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A vapor barrier serves a crucial function in construction by preventing moisture from passing through walls and ceilings. This is important because excessive moisture within a building can lead to a range of issues, including mold growth, wood rot, and structural damage. By effectively blocking moisture from entering the building envelope from areas such as the exterior or beneath the ground, vapor barriers help maintain a dry indoor environment and protect the integrity of construction materials.

In applications such as homes, vapor barriers are typically installed on the warm side of insulation in climates where moisture can condense inside walls. This not only enhances the longevity of the building materials but also contributes to overall energy efficiency by maintaining consistent indoor temperatures. Proper installation is vital to their effectiveness, as any tears or gaps can significantly reduce their protective capabilities. Understanding the importance of each component in the building envelope is essential for construction professionals in achieving durable and sustainable structures.