Replaced the skylights yesterday and found some interesting things. All three of the skylights where cracked and starting to leak. When I pulled the skylight over the shower there was a bump in the roof that was about 1/4" higher then the corners. The skylight had been cranked down tight at the corners so it would conform to this bump and one of these corners had cracked out. What I found was a scrappy piece of 2x4 had been used to frame out the skylight box that varied in thickness from 3 1/4 to 3 1/2 over its length.
So I removed it and installed a new board. You can see the bow in the roof in the picture.
On the other two skylights the screws were tightened so much it had left deep indentations in the plastic. Also for what ever reason all of the existing holes in the skylight flange were not used and the screws were installed through the plastic. These cracked out as well.
When I installed the new new skylights I cut and drilled aluminum strips to help distribute the load of each screw more evenly across the skylight flange. Heartland Tech Support seemed to think this was a pretty good idea so guess I'll see over time how it works out.
Just a little caulking around the edges and screws and I'm done.
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