The same principle has held forever - if you don't keep water out with kick-out flashing, you kick it in.
Proper flashing is always a Best Practice.
Flashing is simple, but has to be done right.
Skipping any part of it will admit water.
Water does what water does - it is dynamically fluid!
Flashing diverts, pure and simple.
Flashing consists, as seen here, of step flashing, under each shingle, stepping, as it were, up the roof.
Counter flashing - which is a second flashing, covering the step flashing.
And then sometimes a form of siding. If the counter flashing is glued properly to a surface, it is fine by itself.
This case has its problems because they forgot a step!
No, two.
They skipped the kick-out flashing diverting water away from the siding and into the gutter, and the covering over the step flashing - the counter flashing.
See how the wood is rotting?
It will continue to rot. And water is getting through, and behind, the step flashing.
How do we know this?
Because from the garage, which abuts this location, we can see that intersection of roofs!
And what skipping a step, or two, causes.
If this was in a location not visible from below, we could only guess at what was happening inside.
Or use a thermal camera, if the location could be reached.
But here we can see it clearly!
And this has been happening since the "roofer" left these sellers this problem.
This is no accident. This was planned for by bad roofing! Maybe planned for by ignorance, but planned nonetheless!
ROOFERS SHOULD NOT BE IGNORANT OF THIS SORT OF THING!
My recommendation: things are as they are and a home inspection observes them. Sometimes things are visible and can be understood. Other times, when they aren't visible, the home inspector will know what's happening, but might not be able to prove it as well as this photo proves this condition. Water, though, always does what water does. It is, as said, fluidly dynamic!
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