What feature should be considered when installing cap flashing?

When installing cap flashing, it is crucial to consider that it should be placed opposite to base flashing. This positioning helps ensure that water is effectively directed away from potential leak points and prevents moisture from penetrating underlying materials. Cap flashing serves as a protective barrier at the roof's edge and around penetrations, such as chimneys or vents, where the roof meets vertical surfaces. By placing it opposite base flashing, the design creates a system where water flows over the cap flashing and is directed downward, ultimately shedding water securely to the exterior.

This consideration is essential for long-lasting roofing performance and helps prevent water infiltration, which can lead to significant structural damage and costly repairs. Proper installation aligned with base flashing also aids in maintaining a continuous and effective water drainage system on the roof.