Ponding on shower windowsill

[Bienes Raices]

There is a small window in the shower and water is ponding on the sill when the shower is used, which apparently is causing the shower wall tiles to deflect below (most of them now need to be replaced). I was told that the sill needs to be re-installed in a different way to prevent this from happening in the future, but I'm not sure how to do that. It has caulking around the sill now but the water is still getting in. Thanks.

[David Niles]

Windows in showers are always a recipe for leaks and rot, problem is, some bathrooms just plain need them to let in light. I will recommend LIGHT ONLY though, exhaust should always be done via a fan.
I just removed an awning style from one of my houses and tried something new, I built my own custom one that is leak and rot proof, I had a friend who owns a glass company build me a thermopane glass to my dimensions and then I built a custom frame out of PVC trim, works great and lets in plenty of light with no place for water to pool.
I understand that much work is not for the average person but just tossed out something I had done, in your case without seeing it, my first recommendation would be to tile the sill and elevate the window side to pitch towards the shower, caulk all your edges and should work well.