Check out this article for more on installing your own step flashing. Water doesn’t always come in through the shingled surface. Wind-driven rain can seep in from above the roof around windows, between corner boards and siding, and through cracks and knotholes in siding. Plumbing vent boots can be all plastic, plastic and metal, or even two-piece metal units. Check plastic bases for cracks and metal bases for broken seams.

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