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Coincidentally was watching a video on how to recognize water leaks and just today noticed this near only 1 of 3 skylights in the living room. The skylights are older (not sure of age) but we renovated the whole house and a new roof is on top up there as of 3 years ago. This has only started happening this winter as I'm sure this wasn't there earlier.
Does this look like something straightforward enough that I can try caulking from the outside and patch the ceiling on the inside or should I hire a pro to break it all up and explore it? Not experienced with how these skylights or the structure around it works. Do they fail at a certain age or is it just likely weatherstripping stuff that requires maintenance?
What kind of roof covering material do you have? It could be the flashing is leaking, is bent, or needs cleaning. It could also be the skylight frame joints.
Looks like a pretty significant leak to me; the whole corner of the box has gotten wet and the tape is coming loose. Were the skylights replaced when you did the roof? If not, I'd guess they need replacing.
This type of skylight generally has a fairly low curb height and fairly narrow flashing width which can increase vulnerability to water intrusion. Keeping the flashings draining well and all joints/frame area sealed may be what you require.as long as nothing is broken and the roofing is still OK.
You saw the full 1600 x 1200 version right? The drywall tape in the box is clearly coming loose, the wood at the top looks cracked in that corner; certainly the paint is. It's possible something other than a good deal of water caused that, but I'd certainly bet on water.
so it turns out it was a poor design of the window casing. There's a metal piece on top that covers each edge and water slides right along and down onto the flashing, but there is a 1/2" gap (I can see the window's wood frame) under that metal at the bottom corner that is exposed to the elements which would allow snow to pack and build up inside. This was on both bottom corners of every skylight. Filled with caulk... thankfully this was an obvious issue that could be resolved easily.
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