Which of the following is NOT a component of building enclosure?

The correct choice—decorative exterior paint—does not constitute a component of the building enclosure. A building enclosure is primarily concerned with elements that protect the interior of the building from environmental factors, as well as maintaining indoor comfort and energy efficiency.

The components that typically make up the building enclosure include windows and doors, insulation, siding, roofs, and foundations. These elements work together to prevent air and moisture infiltration, enhance thermal performance, and support the structural integrity of the building. In contrast, decorative exterior paint is primarily aesthetic and does not provide any physical barrier or enhancement in terms of the functional aspects of the building enclosure. While it may contribute to the building's overall appearance and can sometimes have minor implications for surface protection, it is not a structural or functional component essential to the enclosure's purpose.