I'm not criticizing block versus concrete. But if it were up to me, Reinforced concrete like bomb shelter/bunker is way to go.
Reinforced block wall is stronger than wood/laminate structure.
Reinforced concrete wall is stronger than block wall.
Cement block is strong than cinder block.
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en.wikipedia.org/wiki/Co ··· nry_unitBlock walls (aka Cinder block or cement block-there is a difference between the two) even if filled cavities, are typically filled with grout, not concrete.
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en.wikipedia.org/wiki/ConcreteBlock walls are cheap way to build a foundation or wall. Today, preformed molds from foam/styrene that can be left for insulation values, are common for poured foundations. It's all about cost savings. Since the sheer and load on most single story isn't that much, a block foundation (crawlspace) may be sufficient. But if you want something tornado proof, I would check with a structural engineer.
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en.wikipedia.org/wiki/Re ··· concrete»
en.wikipedia.org/wiki/Rebar»
en.wikipedia.org/wiki/In ··· ete_formIt's not the wind but what is in the wind that also causes the damage (aka projectiles/missiles). And they say its a myth to open your windows to allow pressure equalization. Opening a window means things will fly in.