A step flashing profile refers to the specific shape or design of metal flashing used in roofing applications where a roof meets a vertical wall. It is called "step flashing" because it is installed in overlapping layers or "steps" along the roofline, usually around chimneys, dormers, or sidewalls, to direct water away from the seams and prevent leaks.

Here are some key features of a step flashing profile:

1. L-Shaped Design: Step flashing typically has an "L" shape, with one leg of the "L" extending up the vertical surface (such as a wall or chimney), and the other leg lying flat on the roof surface under the shingles. This design helps create a seamless barrier to water.
2. Small, Overlapping Pieces: Instead of being one continuous piece, step flashing is installed as individual pieces that overlap each other. This layering ensures that water cannot seep behind the flashing and cause damage.
3. Material: Step flashing is often made from materials like galvanized steel, aluminum, or copper, chosen for their corrosion resistance and durability in harsh weather conditions.
4. Standard Dimensions: Step flashing profiles are often produced in specific sizes, such as 4" x 4", 5" x 7", or custom dimensions depending on the roofing system's requirements.

The step flashing profile ensures that water flows over the flashing and shingles, not under them, protecting vulnerable areas on the roof from moisture damage.

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