Weather-resistive barriers are a part of exterior
wall systems that protect building materials
from exterior water penetration. They perform
like a shell for buildings—liquid water that has
penetrated the exterior finish does not pass
through, yet water vapor can escape. By keeping
building materials dry, a weather-resistive
barrier improves building durability, decreases
maintenance costs, and reduces the risk of
moisture-related problems such as bugs, mold,
mildew, and rot. Some weather-resistive barriers
also reduce air infiltration, cutting utility
costs and increasing comfort.
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