How do I keep casement windows from opening?
“… The casement stays above are for wood windows. …” The fact that they ship with wood screws doesn’t mean that casement stays are only for wood windows. They could easily ship with sheet metal screws, or with machine screws. Depending on the construction of your metal windows, you might have enough material in the frames to drill and tap for machine screw attachments, to use self-tapping screws, or to use sheet metal screws to attach them. You’ll have the same fastener issues with whatever devices you add. And if you choose devices which have slack issues, you’ll stand a far higher chance of having the windows damaged in wind conditions, and perhaps losing glass to the area below.
