Paul, Charlie,
???????
I'm looking at that drawing Paul posted and I don't see what is "floating"?
The walls are attached to the "foundation wall" (at least that is what it says) and that foundation wall extends down to the top of the "concrete floor slab" (which runs *under* the "foundation wall" ...
Okay, there is 3" of space to allow for movement of the slab, but ... ????
How to heck is the slab to move upward when the foundation wall is resting on the slab???
Now, I could see the need for that *IF* the concrete floor slab was floating "within" (not under) the foundation walls.
