Has anybody here ever built a double wall block building with that vermiculite type insulation they sell for block walls inbetween the walls? I am getting to point in my life where I can see my old shack just isnt going to cut it for my "golden years". I can either move or put up a little bigger and better house. I really want a stone house (solid stone, not stone veneer over frame), but dont know if I have what it takes doing work alone anymore at least within a realistic time frame and reliable-affordable help is non-existant. I also want it super insulated so came up with idea of a double wall block house with foot or so gap between the walls to be filled with insulation.