What is the purpose of house wrap in residential construction?

House wrap serves a crucial function in residential construction, primarily acting as a moisture barrier. Its main purpose is to protect the building's structure from potential weather damage, particularly from rain and wind-driven moisture that could infiltrate the wall cavity. By preventing moisture from entering while allowing water vapor to escape, house wrap helps to maintain the integrity of the building materials and reduces the risk of mold growth, rot, and other moisture-related issues.

In addition to its moisture barrier properties, house wrap contributes to the overall durability and performance of the home. It also aids in improving energy efficiency by helping to create a controlled environment within the walls, though this is not its primary role. While house wrap may contribute indirectly to aesthetics by providing a clean and uniform surface for siding application, enhancing aesthetic appeal is not one of its main purposes. Similarly, it does not provide insulation or significantly reduce noise pollution, as those functions are typically the roles of insulation materials placed within the wall cavities.