Report what you see:
I do not have the installation instructions available and therefore cannot determine if the skylight was installed as per the instructions, however I did or did not find evidence of a leak at the skylight. All roof penetrations, (plumbing vents, Attic vents, skylights, etc.) will in time leak. Skylights can also drip water, in cold or cooler weather, moisture in the house can condense on the inside of the skylight and may drip down.

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Rick Cantrell
Columbus GA