Window tilts in - how do I attach a panel?

by Florence
(Dover DE, USA)

I would like to make a panel(s) for the high windows in this stairway. The house is in Spain and the windows have a metal casement frame (aluminum I think) The problem is that the windows tilt in to open and they must open as the house does not have a/c. Would clear silicone be strong enough to hold the panel? Should the zinc frame and the window frame be drilled and the panel attached with screws? I haven't started this project yet and I feel that I want to know how to attach the panels before I start this project! Thanks for your suggestions!

Answer
I would attach it with screws like you suggested, but it will also need rebar in several place to make sure the window doesn't start sagging. The rebar would need to be attached on the side the window is tilting.

You don't want to use silicone because it's nearly impossible to get a window out that has been siliconed in. If it ever needed repair you'd be in for a tough job getting the window out.

Does the casement have a slot in it? If it does, you could remove it, take the top piece off, slide the window in the slot and replace the top piece. We do that with aluminum window frames. In Australia we were able to get a lead that was Y shape. The glass went in the V and the "tail" of the Y fit in the slot of the aluminum frame. I don't know if you can get that type of lead, but it might solve your problem (if the casement can be removed).