It was almost as cheap to buy 1,200 ft then to buy the 600 ft that I needed when I did the garage, still have half of it laying around lol.
The biggest benefit to the Warmboard approach is reaction time unlike a slab.
On grade, 4' deep footer all the way around and not the slightest hint of moisture.
One thing good about in floor/ insulated slab, the concrete is a huge thermal mass. I was surprised at how quickly customer's shops warmed up after having the doors open while pushing cars in.
Where the hell have you been, haven't seen you in awhile?
Our living room has a 10' ceiling with 2 doors leading outside, a set of stairs to the kitchen/dining room and a spiral staircase to the upstairs. I'll rework both stairs and move the doors up.. royal pain in the *** but there is no other option if doing it right.
Not completely possible to insulate the frost walls as the basement stairway takes up half of 1 wall (8' below grade) and the rest is a concrete patio then another concrete pad out front. I can't guarantee what the dirt under the slab is like, all I can guarantee is the floor has never shown signs of moisture and that I used sand and a moisture barrier under it.
