I took this picture yesterday at a home in Frisco. I was inspecting the roof and found this. As you can see, the tops of these sewer vent boots are installed OVER the roof shingle. The top half of the flashing should be UNDER the shingles... for obvious reasons. When it rains, water runs right under these flashings and into the attic and down to the ceiling and walls below. In many cases the leaks go undetected as the sewer vents are in the wall cavity, the water simply collects inside the wall cavity and floor below which can lead to mold problems.
Properly reinstalling the flashing is a fairly inexpensive and easy repair. The home buyers were very thankful this issue was brought to light in the inspection report and they are addressing the matter now that they understand its importance.
I love it when simple fixes save major $$ in repairs!
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