Rudy,

Thanks, at request, I took a couple more images:

http://img195.imageshack.us/img195/9...apinterior.jpg

The above is a lit up version of inside the gap.

And:

http://img132.imageshack.us/img132/7...utfoundati.jpg

This is a zoomed out view of a normal part of the foundation. It is about
8" high.

Bill

"Rudy" wrote in message
...

Just to add, this is a single floor home with no basement or crawl space.


It looks like what you've pictured there is a straight concrete "slab"
with no support or footings.
Some homes are built on a slab only . [See "Post tensioned slab] but
yours doesn't look like that.
The pictures look like a 'plain ol' slab w/o any perimeter support.
Like someone said: more details and pictures that show a lot more (ZOOM
back) needed.