New answers tagged studs
The outside corners of your walls have metal "drywall corner bead". (There's also paper and plastic.) Sometimes, though rare, there's metal bead in the inside corners. The corner bead itself is relatively thin, but if you're trying to get through it, either with a drill bit or a screw, you'll need to push reasonably forcefully. If you don't, the bead can ...
Unless it's a new construction home, it's unlikely to have metal studs. I think you're finding protection plates, covering wires or pipes, running through wood studs. That would be why you aren't finding all the studs to hold the magnet along their entire vertical lengths. Where you are finding it to hold throughout, is probably metal corner bead.
No. Wood needs wood screws. These have a sharp point for piercing wood and a deeper thread than machine screws (often called bolts). The shallower thread on bolts is fine for metal, but not for wood. For ease in setting a deep screw, you should also pre-drill the holes with a bit slightly thinner than the shaft of the screw. And for shelf brackets, I ...
I used z-clips also known as french cleats. Perfect. They distribute the load across the sill of the window, including to the studs on both sides. Seems to be holding fine.
There's metal corner bead under the finished surface. It will be more difficult to screw into than drywall alone. Put the screw more than an inch away from the corner and you should be fine. As a renter, just make sure you remove the curtain and patch and paint the holes you made when you need to leave.
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