I'm also looking for info on slabs and foundations. My issue is a two car garage on a new build.
The wife and I are putting a house on land we bought, and want a two car garage. Advantages/disadvantages of garage under (foundation walled) v. separate garage build on side of house.
I did get some info, for concrete, from a local concrete suppler they gave an a number of $400/cubic yd. for walled foundation and $300/cubic yard for slab; nuts, bolts, re-bar, mesh extra. Not sure if that included delivery costs, but I'm guessing @10 yards per truck load. I added @ 10% for spillage when I calculated cubic yards.
The footprint for garage on side is 84 ft. X 33ft.; garage under footprint is 60 ft. X 33 ft.
The enclosed URL may not be addressing a "floating"slab.
https://www.google.com/search?q=conc...w=1366&bih=604