The drill hitting and not penetrating when I hang curtains

interior

I'm living in an apartment. So far I've put up 2 sets of curtains and had the same troubles with both attempts.

One set was over a sliding mirrored closet door (tacky!) and the other set was over a window. What's happening is there's something behind the drywall that's very solid and I can't seem to get my drill into it. In the last apartment, self-drilling anchors like a metal version of these did the trick but in this apartment they couldn't penetrate either. My first thought was some kind of stud, but I ought to be able to drill into wood, right? My next thought was perhaps the doors/windows had some frame that jutted into the wall for support, but the last set of curtains was 4" above the windows. I've never seen a window that had 4" of metal surrounding it.

What the devil could it be? Is this something common? How would you approach this?

Best Answer

Are you sure the walls and headers are wood? It is possible if the construction is new, it is built with steel studs. Check with your landlord. If they are steel, you can pilot a hole with a titanium bit or use self drilling screws made for steel framing. It would be very unlikely to find wiring and nail guards that close to the edge of a window or door frame.