What type of flashing is installed at the top of sloped roofs abutting a vertical wall?

The correct type of flashing installed at the top of sloped roofs where they meet a vertical wall is apron flashing. This type of flashing is specifically designed to direct water away from the wall and prevent it from seeping behind the roof covering. Apron flashing is typically installed under the shingles or roof material and extends out over the wall, serving as a protective barrier against water infiltration.

In the context of roofing, understanding the placement and function of different types of flashing is crucial for effective water management and preventing leaks. Apron flashing is important in locations where the roof meets a wall because it ensures that water flows off the roof and away from the structure, rather than getting channeled down the wall where it could cause damage.

Other types of flashing, like base flashing, counter flashing, and corner flashing, each have specific applications that differ from the function of apron flashing. Base flashing is generally used at the base of vertical surfaces to redirect water, counter flashing is set to protect roof penetrations such as chimneys by overlapping the base flashing, and corner flashing is applied at exterior corners to help prevent leaks at those junctions. Understanding the purpose of apron flashing in this context helps clarify why it is selected for this particular installation.