Some areas (inspectors) understand floating slabs, and some don't.
They work great, however.
Another alternative I've used on shop buildings is to have the structure
supported by piers (sonotube, whatever)
that go well below the frost line, and then an ordinary slab floor.
hth
bill

"HotRod" wrote in message
...
I know several people including my Father who have large shops on what's
called a "floating slab" there are not any footers, the whole slab is
designed to move and "float" as the frost comes and goes. My Dads shop even
has a hoist in it without any problems in cold Ontario for over 15 years,
not even a single crack...