I have no idea what my wall is made of, but I can't get into it with a standard drill and bit or with a "self-drilling anchor". All I managed to do is gouge out a hole in the wall. Any idea what it may be made of, or how to get into it?
Another wall has a similar problem: I can't hammer a nail into it deeper than a coupla mm. Presumably made of the same stuff, but this time I didn't try much harder than that to get into the wall.
Thanks,
Michael Hamm not much of a DIYer (obviously) snipped-for-privacy@math.wustl.edu