Thanks Matt,
Yeah, I did pick up on insulating the edge. I have a good link to a site that describes most everything you guys have pointed out, right down to the plastic clips that stick into the insulation.
I'm having a hard time believing that the slab (with the 2" hi density insul supporting it) would have the nuts to adequately support the weight of vehicles, trucks, and implements. It just don't seem right. I'm sure that upgrading to rebar would provide improved lateral distribution of the point loads, but is that the reason...or...is the foam really strong enough. Sorry, but I just can't buy it.
Bski, buy a sheet of the foam and drive the truck onto it. See what happens with a (near) point load. Then distribute with a sheet of 3/4" plywood or a large board. Extrapolate.
![[Linked Image from i.pinimg.com]](https://i.pinimg.com/736x/ed/b5/e7/edb5e7f935843b996cf52be593c9ebd2--smoothie-smooth-collie.jpg)
