In roofing, what does the term "flashing" refer to?

Flashing refers to materials used to direct water away from joints in a roofing system, thereby preventing leaks and water exposure that could lead to structural damage. It is typically made of metal or other water-resistant materials and is installed at various points in the roofing system, such as around chimneys, vents, and roof valleys, where water is likely to collect or flow. This strategic placement ensures that any water that might infiltrate these vulnerable areas is redirected safely away, thus protecting the integrity of the roofing and underlying structures. The importance of flashing in maintaining a watertight seal cannot be overstated, as it plays a crucial role in extending the lifespan of the roof and preventing future costly repairs.