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NC State Extension

Building Enclosure – Defined

That part of any building that physically separates the exterior environment from the interior environment(s) is called the building enclosure or building envelope. The primary function of the enclosure is to separate the interior environment from the exterior environment to which it is exposed. Physically, the typical building enclosure usually consists of the roof system(s), the above-grade wall system(s) including windows (fenestration) and doors, the below-grade wall system(s), and the base floor system(s).