Properly installed step flashing should appear as a clean, uniform, and orderly series of individual L-shaped metal pieces neatly bent at a precise ninety-degree angle, ascending the roof slope in a stepped pattern. Each piece should lie flat against the vertical wall and extend horizontally over the roof deck underneath the next shingle. When viewed from a distance, the visible vertical portions should overlap cleanly without large gaps, bulging edges, exposed nail heads, or crooked alignments along the wall junction.
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