What is the purpose of flashing in roofing?

Flashing plays a crucial role in roofing by directing water away from joints and seams, which are vulnerable points prone to leaks. It is typically made from materials such as metal or plastic and is installed in areas where different roof sections meet, such as around chimneys, vents, and along roof edges. The primary function of flashing is to create a watertight barrier that prevents moisture from penetrating beneath the roofing material, thus protecting the underlying structure and extending the lifespan of the roof.

While other aspects of roofing may involve structural elements, insulation, or even aesthetic components, the main and essential purpose of flashing is to manage water and enhance the durability and performance of the roofing system.