What material is primarily used to prevent water intrusion along roofing edges?

Flashing is primarily utilized to prevent water intrusion along roofing edges because it acts as a barrier that directs water away from vulnerable areas, such as seams and joints where different materials meet. Typically made from metal or waterproof materials, flashing is strategically installed around chimneys, vents, and along the edges of roofs to ensure that water does not seep beneath the roofing material. Its effectiveness lies in its ability to create a watertight seal, safeguarding the roof structure and preventing leaks that could lead to water damage inside the building.

While insulation, adhesive seals, and drip edges serve important roles in roofing systems, they do not specifically address the prevention of water intrusion in the same manner. Insulation primarily provides thermal resistance rather than waterproofing. Adhesive seals can help secure roofing materials but are not the main defense against water intrusion. Drip edges assist in directing water runoff and protecting the roofing material from water damage, but they do not provide the same level of water sealing as flashing does. Therefore, flashing emerges as the most effective solution for this specific concern.