What is the main goal of using flashing in construction?

The primary objective of using flashing in construction is to prevent water intrusion. Flashing is a vital component installed in various areas of a building, particularly in roof valleys, around chimneys, and where different building materials meet, to direct water away from critical areas that are prone to leaks. It serves as a barrier to divert water to the exterior of the structure, thus protecting underlying materials from water damage, rot, and mold growth. By effectively managing the flow of water, flashing contributes significantly to the longevity and durability of a building.

While improving structural integrity and facilitating energy efficiency are important aspects of overall building design, they are not the main function of flashing. Similarly, enhancing exterior aesthetics is a secondary benefit rather than the primary purpose of flashing, which is fundamentally about water management to maintain a watertight seal in construction.