Step flashing is used along walls that intersect the roof. Each short section of flashing channels water over the shingle downhill from it.
But if the flashing rusts through, or a piece comes loose, water will run right behind it, and into the house it goes. Rusted flashing needs to be replaced. That means removing shingles, prying siding loose, and then removing and replacing the step flashing. It’s that simple. But occasionally a roofer forgets to nail one into place and it eventually slips down to expose the wall.
SOLUTION 1: Push a loose piece of step flashing right back into place and then secure it with caulk above and below.
Slipped flashing PROBLEM 1: Unnailed step flashing can slip down and channel water into the wall.