Where is L flashing installed?

L flashing is installed above window and door header trim as a critical component for directing water away from these vulnerable areas. It serves to prevent water intrusion, which can lead to rot, mold, and other damage to the structural elements of a building. By placing L flashing effectively, it ensures that any water that drains down the surface of the wall or roof does not enter through the top of the window or door framing, forming a protective barrier that guides the water to flow away from the opening.

In contrast, other locations where flashing might be considered, such as at the base of the roof, the eaves, or the foundation level, serve different functions or may utilize different types of flashing. For example, while base flashing is important at roof junctions, it's not specifically termed L flashing and is instead focused on preventing water from entering underneath roofing materials.