The insulation under a slab is a good idea for heated buildings always. For unheated buildings that will never see a furnace it is a waist of money, (in my area anyway).
I insulated my frost walls inside and out and under the slab in the house. I heat it year round but only at 50 deg. in times when I am not there. Bout Mid Dec. it takes 3 days to bring the slab up to a temp that will help keep the furnace off instead of turn it on. It kills me to get there on a Fri. night and by Sun. morning when I am leaving it finally heats up to a nice warm temp. The furnace heats the house fine but I can't wait till I run the tubes on the floor and finish it off right. Couldnt put in floor heat cause I have a on demand water heater and was planning to pour the self leveling compound over the floor later when I move. I left the trim off for that purpose on the floors.
Garages? I built mine before I joined here. Big mistake!! I had no plans for a tractor that needed a taller garage door. My plans changed and I am stuck with the short doors and the ever danger of creating a unexpected opening in the walls. I have not and will not finish my walls in the garage. The mice will have 5 generations of families peeing and crapping inbetween. I built mine too samll also 28x34. Thought that was all the cement I could afford and stay married especially since I went to a 6" floor with double the rebar. The only benifit to this is that I can have an excuse to build anouther one (right this time)

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