Hi and thank you for your accept. "Only at the edges" is a BIG clue! All edges, or just edges perpendicular to the joists? How long ago did you have the termite/ant inspection? Did the inspector check the areas of concern? There could be old fungal rot. I have never heard of a dry crawl space with a pier & beam foundation. They can be "dry" at the time you crawl under, and damp later after a rain. You should crawl under there your self with a bright worklite/flashlight to identify the type & condition of the subfloor. Also measure how far apart the floor joists are. Have someone step on the area in question while you are under there and observe what moves. At this point I am relying on an opinion that was given to you, and your interpretation of the phrasing of that opinion. Neither you or I can say what is wrong without you getting a firsthand look. photos may help. To upload photos:
1.) If you see a paperclip icon in your tool bar at the top of the reply box ( where you are typing ) go to number 2 .
If you don't see one then press show tool bar on the upper left of the reply box and then go to number 2.
2.) Press the paperclip icon, you should get a window that has a browse button option on it.
3.) Press the browse button on this box. You should then get a second box with a browse button on it.
4.) Press the browse button in this second box and you should get a window that you can use to navigate to the location of the photo file on your computer.
5.) Make your choice of photo file by double clicking on it. The choice box should disappear and the path to the photo file should now appear in the box.
6.) Now press the OK button on that box. That box should disappear and the path name should show up in the first box now. If it doesn't show right away give at least one full minute.
Don't press the insert button until you see a path name in the box. It will only show up as a red x if you do.
7.) Press the insert button on that box once the file path appears