What is the primary purpose of housewrap in wall construction?

The primary purpose of housewrap in wall construction is to minimize air flow. Housewrap acts as a weather-resistant barrier that allows vapor to escape while preventing air and water from penetrating the walls. This is crucial in maintaining energy efficiency within the home, as it limits drafts and reduces energy loss associated with unwanted air infiltration.

While housewrap does contribute indirectly to thermal insulation efficiency by preventing air leakage, its main function centers on controlling air movement and protecting the home's interior environment. This helps to create a more stable indoor climate and can also aid in the prevention of moisture buildup in wall cavities, which can lead to mold and rot. Thus, focusing on its ability to minimize air flow highlights the key role it plays in the overall efficiency and durability of building envelopes.