Best roof protection
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Step flashing redirects the water
back onto the shingle. Even if one
piece of step flashing fails, the
flashing and shingle below it start
the process over again.
Continuous flashing against a sidewall is one way to install a roof, but it’s not the correct way. It may
seem as if a single piece of flashing would offer more protection than
many pieces of step flashing. But it doesn’t work that way. Once even
a small section of roofing cement fails, you’ll have a leak. Each additional rain
adds more water, and before you know it, you’ve got rotted wood.
Step flashing offers far better protection from leaks, because even if a single
piece of step flashing fails, the water just hits the next lower piece. That flashing
directs the water onto the shingle and the water drains down the roof.