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So your concrete/masonry homes are actually composite homes, using rigid insulation in between the layers of concrete/masonry, the insulated forms, and super light wieght concrete either air entrained or filled with some sort of fibers. yes QUITE expensive, we looked into them. 3X the cost per square foot compared to a conventional 'stick' wall.
I can't argue many buildings can be superior to code, but then money does become an object (as opposed to money being no object) I believe we were talking in a slightly more affordable context, at the very least interior walls, treatments and of course furniture that can be deadly from smoke and fumes.
I remember seeing a type of hollow core masonry block wall system that involved stacking the blocks in half bond and then locking them in place with rods driven thru the voids which were then filled with a nonCFC styrofoam type bead. It was very thermally efficient and fireproof.