Which material is most commonly used for traditional flashing?

Aluminum is the most commonly used material for traditional flashing due to its favorable properties. It is lightweight, resistant to corrosion, and can withstand various weather conditions, making it ideal for protecting vulnerable areas of a roof from water penetration. Aluminum flashing can be easily shaped and installed around chimneys, vents, and other penetrations, ensuring a tight seal that helps prevent leaks.

Furthermore, aluminum offers long-term durability and low maintenance requirements, which are essential qualities for roofing materials subject to exposure to the elements. Its ability to be coated or painted allows for additional protection against corrosion and enhances its aesthetic integration with the roofing system. These characteristics make aluminum the preferred choice for traditional flashing over materials like plastic, wood, or glass fiber, which may not provide the same level of durability or effectiveness in roof flashing applications.