It is always kind of sad, sometimes amusing, when a homeowner knows that some component is required at the home but does not know the correct way to install it. Here is a photo of a metal flashing, above the eave on a sloped roof. The fellow who installed it figured it would be a good flashing to protect the sheathing below. The problem is, the top of the metal flashing needs to go under all of the shingles not just some of them. I lifted a shingle, for a better view, but you can see how water would get down under the flashing between tabs. Good thought, lousy implementation.
Thanks for looking.
Steven L. Smith