I'm putting up a TV in a room and it's been a nightmare. First, the so called "stud finder" was giving me different readings all the time. It felt like somebody was behind the wall moving the studs to aggravate me. It was also "warning" me about electrical wires. I got on the attic, no wires going down on that location. But a 2x4 lays horizontally and cover the verticals studs so I can't locate them from there.
Came back down and looked at the wall in anger. Then noticed marks of previous screws, cheaply covered by a layer of putty. I took a needle and stick it in using pliers. It felt like drywall consistency for about 3/4 of an inch, then hit something more solid that felt like wood.
Confident on having found the stud, I fired up the dril on location. Again, it felt like drywall for 3/4 of an inch, then felt definitely like wood for about 1.5 inches when all of the sudden I hear the peculiar sound of a drill-bit grinding on concrete. I was expecting at least 4 inches of wood, and no concrete.
I went outside and the exterior seems to be some kind of decorative concrete. But still, shouldn't the wood section be deeper? I am very confused.