Insulation and soundproofing
Insulating below slab-on-grade floors
...basement that the idea of building a slab-on-grade creates an instant sense of fear and doom in many. We assure you this is not new, and it works.
The reason we build basements and stay 4 to 5 feet below grade is to avoid frost heave, using dirt to insulate. With a slab-on-grade, the difference is you use 'insulation' ...