Scope. Install new step and kick-out flashing where an existing roof meets an existing wall as part of a roof replacement. It can also be done as a stand-alone retrofit measure or as an exterior wall upgrade. Install and properly integrate flashing at the intersection of an existing wall and roof, as follows: Inspect the wall and roof framing.. Beginning with a clean, dry, and solid surface ensures a secure bond. Any debris, moisture, or unstable sections can hinder the flashing's effectiveness, potentially allowing water ingress. Install the base flashing under the roofing material, directing water away from the wall. The step flashing, which works in conjunction with the base.

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A critical detail for water intrusion management, the transition from a roof to a wall needs extra attention. Here, we show the method for flashing the roof.. Key Flashing Details at Building Wall Corners. Corner boards are prone to leakage due to shrinkage of materials and wind exposure. For simple, effective backup protection, add a spline of asphalt felt paper at outside corners so that it extends 6 inches beyond the corner boards.