Installed over sheathing and behind the exterior building facade, housewrap functions as a weather-resistant barrier that protects structural durability. This crucial layer of defense protects against penetrating wind and rain while simultaneously allowing water vapor to escape. By controlling the structure's airflow and preventing water intrusion, housewrap also contributes to a building's overall energy efficiency.
However, to be effective, housewrap must be water-shedding, and in this environment (humid most of the year) have a low moisture vapor transmission rate (MVTR), and be installed correctly. Improperly installed, ripped, or torn housewrap allows water to infiltrate damaged areas, leading to mold, rot, decrease in insulation R-value, and possible future structural damage.
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