What is the main purpose of flashing on a roof?

The main purpose of flashing on a roof is to direct water away from critical areas such as joints, seams, and transitions. This is crucial for preventing water penetration and potential damage to the underlying structure. Flashing serves as an essential barrier against water intrusion, channeling water off surfaces effectively and ensuring that it flows to the drainage systems rather than allowing it to pool or seep into vulnerable parts of the roof or building.

While other choices may relate to aspects of roofing materials or how they interact with water, flashing is specifically designed to manage water flow and protect the integrity of the roofing system. Therefore, it is vital to correctly understand its role and implementation in roofing design to ensure lasting performance and minimize water-related issues.