The base of houses is made of cement.
Using only that for a whole house would be foolish. Not only would it not make it the slightest bit safer against a tornado, it would cost an incredible amount and could possibly make the weight of the house tilt it in most arable soil.
Plus, we have an incredible amount of forest around here. If you are European you probably think that we are small countries because we have so small provinces and states... But that's a mistake the vast majority of Europeans make only once... They often realize on the field that it is simply stupid to plan Montréal-Vancouver in a single day.
lol
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