http://img161.imageshack.us/img161/455/floorsupport.jpg

http://www.savefile.com/files/2153146

The interior walls had dropped away from the ceiling about a half inch
in the middle of the floor, so I went to check the condition of the
floor support.The center of the floor is supported by 3 2x8s (or maybe
2x10s). The main floor joist in the center (the one that all the other
perpendicular joists butt into) is made up of two seperate sections
that meet in the middle. As you can see in this video/picture, the
person who was paid to do this decided that it would be ok to only
support one of the two ends where these sections come together. meaning
that the end of one half of the floor is simply hanging in mid air,
and, as you can see, it has dropped over time, likely contributing to
the noticible separation of the interior walls from the ceiling.

Poor.