[ErVikingo]

I appreciate all the advice (please don't hold back)...

If you think I should go with a thicker vapor barrier, I will ask for it. I will look into the Stego.

Regarding the welded wire mesh, there are sections where the engineer called for 2 layers (with a separation). He specified that it is not to be the "roll" kind but the one that comes in mats. The GC is already thinking of the added complication of carrying the "mats" over the tall rebar.

The soil is of very high quality but since the slab is so large I specifically asked them to over-design as I'm hoping for the least amount of cracking (even though I understand that apparently all concrete cracks).

The slab on the garage(s) is thicker than on the rest of the house.

Still trying to decide what the finish of the garage floors will be. I'm afraid of an epoxy or poly aspartic type product peeling off. Any suggestions?

I will have a day to day garage area for 3 cars and a separate (yet attached) large garage/workshop with 3 wide bays (one double depth). I plan to do some restoration work and the stuff we all like to do.