The concrete hospital in Joplin had to be condemned after being hit by a tornado. Tornadoes can drive a 2×4 through concrete. Houses have entry doors and garage doors and windows, which are weak points that are going to fail. So unless you want to live in a bunker, concrete isn’t a big improvement for a big increase in cost. That’s why you often see a single, small, hardened shelter, preferably underground, instead of hardening the whole house.
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