Step Flashing
L-shaped metal flashing pieces installed where a roof meets a vertical wall.
Definition
Step flashing is a series of L-shaped metal flashing pieces installed where a roof plane meets a vertical wall, such as where a roof meets a dormer or chimney. Each piece overlaps the one below and interlocks with the shingle course, creating a stepped pattern that directs water away from the wall/roof junction. Proper step flashing is one of the most important details in leak prevention and is often the difference between a roof that lasts 30 years and one that leaks in year 5.
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