Which material is typically used for flashings?

Flashings are crucial components in roofing systems, designed to direct water away from critical areas and prevent leaks. Modified bitumen is often used for flashings due to its flexibility, durability, and excellent adhesion properties. It can effectively seal joints and transitions, allowing it to be shaped and applied in complex roofing scenarios, ensuring a watertight fit around chimneys, vents, and other interruptions on the roof surface.

The other materials mentioned are generally not suited for flashings. Roll roofing, while it can be used in some instances, does not offer the same level of water-resistance or adaptability as modified bitumen for flashing applications. Fiberglass lacks the necessary waterproof qualities when used alone for flashings. Asphalt shingles, while effective as a roofing material, are not designed to serve as flashings and may not perform appropriately in that role, as they are meant to cover larger surface areas rather than manage water flow around critical roof areas.