Does Step Flashing Need Counter Flashing

Depending on the construction situation, a step flashing roof is sufficient; vinyl siding can double as counter flashing as long as the step flashing goes underneath it. Otherwise, counter flashing is a critical requirement.

Is counter flashing necessary?

Counter-flashing is designed to prevent moisture from entering behind the vertical flange of headwall or sidewall flashing. Sometimes, the exterior wall-covering material serves as the counter-flashing, and sometimes a separate counter-flashing might be installed.

Where is counter flashing used on a roof?

Counter flashing is used on walls and chimneys like step flashing. Unlike step flashing, the piece of flashing is sawed into an existing mortar joint, and the metal comes over the top of the brick. Like step flashing, counter flashing is sometimes installed in a step-by-step method.