I worked with a new builder once where I buried all of my wires up in the joists and specifically told the GC that I had all of the wires mapped out and to make sure that the insulators and drywallers not pull the wires down. I went back to check on the job later and the GC had one of his guys put up steel mudrings (which weren't straight or lined up with anything) so that it would be easier for me to find my wires.. :(