What is the purpose of flashing in construction?

Flashing is a critical component in construction, primarily designed to prevent water intrusion at joints and where different materials meet. It is typically installed around rooftops, chimneys, walls, and windows, acting as a barrier that directs water away from vulnerable areas. This helps prevent water from seeping into structures, which can lead to mold growth, wood rot, and other serious damage over time.

Enhancing aesthetic appeal, providing structural support, and insulating against heat loss are not functions of flashing. While flashing can contribute to the overall integrity and longevity of the building, its main role is in moisture management, making option B the correct choice.