Which of the following materials is NOT normally used for flashings?

Timber is not typically used for flashings in roofing applications. Flashing serves the crucial function of directing water away from critical areas of a roof, such as joints, valleys, and protrusions, to prevent leaks and water damage. Materials chosen for flashings must be durable and resistant to the elements, as they are subjected to harsh weather conditions and moisture.

Copper, aluminum, and steel are all suitable materials for flashings due to their properties. Copper is valued for its longevity and resistance to corrosion. Aluminum is lightweight, easy to work with, and also resists rust, while steel—particularly when galvanized or stainless—offers strength and durability. Timber, on the other hand, is susceptible to rot, warping, and decay when exposed to moisture over time, making it an impractical choice for flashings. This is why it stands out as the material not normally utilized for this specific roofing application.