Can't seem to get a handle on this problem. Condensation keeps appearing on the botton (inside) of the shower skylight. The lower bubble is not sealed and is only held up by four screws. Should the lower bubble be dicor sealed between the ceiling and the bubble flange?
Could it not be condensation but actually a leak in the outer skylight that is letting water form inside the inner skylight? I had a small crack in my outer skylight and the moisture formed inside the inner skylight after a rain. Take a trip up on the roof and examine the skylight for cracks and/or missing caulking.
By the way I did not seal the inner skylight to the ceiling, the four screws seem to hold it tight enought to keep moisture from entering. Also using the bathroom vent fan when using the shower to remove excess moisture will help
2004 Southwind 32VS 8.1 Workhorse chassis
2002 CRV Toad
U. S. Gear Unified brake system
Retired Fire Captain, SFD
You may have a leak from the upper bubble or near by or removed it recenly while the bathroom was humid.
The only time I had moisture was when I removed the lower bubble to see how it looked up there and look for signs of leaks from the upper bubble. I had just cleande the tub and shower and it was pretty humid. I had condensation afetr that and removed it again to check for leaks. Finally figured out it was because I removed the lower bubble while it was humid in the bathroom. It eventually went away in a few days. Never seen it again. I only remove the lower bubble a couple times a year to check for leaks when the bathroom is dry.
Don't think it's an exterior leak, as whatever water forms is very clean, and only appears as vapor on the inside of the upper bubble. Religioussly, we use the fan when showering. With the lower bubble removed, even through a driving rain no vapor forms. I just don't get it. I don't even know whether sealing the lower buble against the ceiling will make it worse by trapping moisture. Thanks for the consideration.