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Both scenarios have foundation wall that extend to below the geographical area's frost depth. Connecticut is 42" deep from grade.
Crawl spaces are done to allow for access to under-floor utilities such as plumbing and electrical. The raised floor also keeps the living environment seperated from the moisture and cold-sink of the ground. elevated floors can be insulated and maintained easier as well.
Concrete floors are usually poured 4-5" thick over a 6" stone base and 6 mil poly vapor barrier. They can be poured monolythic (one big pour) or they can be poured in sections with expansion joints. If poured monolythic then control joints will need to be saw cut into the slab surface to allow for controlled cracking. One aspect of concrete floors that is always missed is the insulation. The earth hovers around 55 degrees F. With a living space at 70F and the earth a 55F you have a 15F differential without any insulation. If I were to suggest a slab composition for modern times it would be 6" stone base, 6 mil poly vapor barrier, 2-4" polyiso, 4-5" concrete slab.
Crawl spaces are done to allow for access to under-floor utilities such as plumbing and electrical. The raised floor also keeps the living environment seperated from the moisture and cold-sink of the ground. elevated floors can be insulated and maintained easier as well.
Concrete floors are usually poured 4-5" thick over a 6" stone base and 6 mil poly vapor barrier. They can be poured monolythic (one big pour) or they can be poured in sections with expansion joints. If poured monolythic then control joints will need to be saw cut into the slab surface to allow for controlled cracking. One aspect of concrete floors that is always missed is the insulation. The earth hovers around 55 degrees F. With a living space at 70F and the earth a 55F you have a 15F differential without any insulation. If I were to suggest a slab composition for modern times it would be 6" stone base, 6 mil poly vapor barrier, 2-4" polyiso, 4-5" concrete slab.