I’m in the process for insulating above my attached garage and can see evidence of previous water. Not knowing if this is is ongoing or had been fixed (we are not the original owner) I have been checking after every rain event since July when I started this project. After a very heavy windy rain there was a small wet spot below the first elbow under the roof. Looks like water is running down inside the vent pipe and leaking out at the elbow. The stains on the vent pipe show where the water is running out.
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A roofer suggested replacing the cap on the flue with a different style. He is not very sure what to do and this is his suggestion.
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The plumbing contractors who came to give me estimates for replacing the water heater do not do any work on the flue. Just swap out the heater which I have had done.
The flashing at the roof is sound and there is no evidence of any leaking there.
So, any advice is welcome. the roof is much too steep for me to work on. Those days are long gone.
NOTE: I take photos with iPhone and create the post on my MacBook laptop. I do not use any editing software or any non-apple software and my photos routinely appear willy-nilly once I post them despite appearing normally to me.