18.15 Common mistakes

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Spending on a commercial “bunker” instead of on water, sanitation, and power, which are what you use in every emergency.
Believing that a box-fan filter protects against chemicals.
Sealing the shelter in summer with no plan for the heat. Bringing a generator, grill, or camp stove into the apartment “because it's ventilated.”
Fortifying doors and windows to the point that you can't get out in a fire.
Putting heavy mass on a second floor without thinking about the load.
Forgetting sanitation: it is what makes a shelter uninhabitable fastest.
Staying on the ground floor during a flood or under a chemical evacuation order: the right plan there is to leave (chapters 10, 16, and 24).
Building without an engineer or permits.