An exterior house wrap will do all of the following except:

An exterior house wrap will do all of the following except:

• A. Help keep water out
• B. Allow water vapor passage
• C. Insulate the wall
• D. Help keep air out

Answer: (C)

Exterior house wrap acts as a weather-resistive barrier: it blocks bulk water from entering the wall, allows water vapor to pass through so the wall can dry, and helps reduce air leakage through the wall. It’s there to manage moisture and air, not to provide insulation. Therefore, the statement that it insulates the wall is not true. In short, it keeps water out, lets moisture escape, and air leak reduction, but it does not add meaningful insulation value.

Exterior house wrap acts as a weather-resistive barrier: it blocks bulk water from entering the wall, allows water vapor to pass through so the wall can dry, and helps reduce air leakage through the wall. It’s there to manage moisture and air, not to provide insulation. Therefore, the statement that it insulates the wall is not true. In short, it keeps water out, lets moisture escape, and air leak reduction, but it does not add meaningful insulation value.