What is the primary purpose of flashing in roofing?

The primary purpose of flashing in roofing is to prevent water leakage at joints. Flashing is typically made of metal or other water-resistant materials and is installed at critical points of the roofing system, such as where different surfaces meet, around chimneys, vents, or skylights, and along edges. Its design helps to direct water away from these vulnerable areas, ensuring that moisture does not infiltrate the roof structure or the building beneath it.

When flashing is properly installed, it creates a barrier that blocks water from seeping through gaps where different materials meet or where there may be structural irregularities. This is essential for maintaining the integrity of the roof, prolonging its lifespan, and avoiding costly repairs that can arise from water damage. Thus, the effectiveness of flashing is integral to the overall function of roofing systems in preventing leakages and moisture problems.