I'm attempting to mount a shelving system (specifically, a Rubbermaid single-track adjustable shelf) to a wall and am running into something quite strange.
Here's what I know:
- Studfinder appears to show studs at 16" intervals.
- Upon drilling a pilot hole on one of these intervals, the bit pops right through the 1/2" drywall, passes without resistance through a small bit of free space, then runs into something hard to drill through.
- Removing the bit from the drill and manually poking the offending substance produces an airy sound, like a big metal plate.
- Drilling a few feet upward at the same horizontal position yields the same result.
The wall is an interior wall in a recently-built high-rise apartment building shared between two apartments.
- What's this metal thing I'm hitting? (I doubt it's a protective plate, as it spans the height of the wall, and sources say a metal stud should be "easy to drill through", which this is not.)
- Why am I (apparently) finding a gap behind the drywall and no stud at these 16" intervals?
- What are my options for mounting this shelf now? (Toggle bolts?)
Further testing I plan to try:
- Scanning wall with a strong magnet (my hard drive magnet hasn't shown me anything yet...)
- ...yeah, I'm out of ideas.
Thanks in advance!