This was about the 10th time that I've encountered this. Someone thinks they are really clever and takes a piece of glass from a patio door slider and some L metal and makes a skylight out of it. This one sets the record (about 30 years) for being on the longest. I could identify at least three different caulks around it, so it hasn't been 30 leak-free years.

I love the plexiglass skylights, saw a great one last year. 30"x40" piece of 1/4" plexi, installed like a vent. The guy predrilled it,I would imagine. Laid the shingles over the side in a bed of tar, and thats it. Other than a bit of sagging, apparently it never leaked??? Was at least 5-6 years old when I came across it.
Hah thats cool. I reroofed the rear of a clearstory a couple months ago. 2/12 and had shingles mudded to the old flashing below the windows. The windows were made out of storm doors panes. They used crap caulk or else it might have lasted longer. We rebuilt the framing around the windows and installed TPO. Pretty neat idea tho, Ive not really seen many home made skylights around here. They just mud em until you can barely see out them.
I live in a old mobile home and now my brain is moving towards skylight...
Rocky, what you are seeing is the reflection of the chimney in the glass. All I was doing on this job was a cleaning and broken tile replacement. Most times I point out potential problems to customers, but existing messes like this, I steer clear of until asked.
Vaa, that's an example of craftsmanship to do the job. What I usually see with fake skylights is crapmanshitz.
I see the home made ones all the time.
Sometimes is nothing more than a piece of plexi-glass just laid right down over the hole.
:dry:
Quite ingenious and affordable. I think I would have left that bottom row of tile at the top out and a couple inches either side for water and debris clearance. It certainly is a big water dam. Is that a stain I see in the far upper right corner on the drywall?