Go steel. Especially if you are in the US Midwest. Due to current prices you could even go concrete, for about the same as lumber depending on your area. ICF blocks have come a long way and it's gotten easier to find builders that know it. https://www.cement.org/cement-concrete/paving/buildings-structures/concrete-homes/building-systems-for-every-need/insulating-concrete-forms-(ICFs)
If you're cool with something more unconventional then look into monolithic domes. Things are actually price equivalent per square footage to framed/conventional and as close as you can get to disaster proof without actually being a bunker. https://www.monolithic.org/domes
Fuckin rad. We had a tornado touch down about a mile from our current house relatively recently, which prompted our interest in steel. Definitely need to do some research on the monolithic domes.
M. Domes have survived 5 ton bunker buster bombs intact. Tornadoes/high winds flow right past their round shapes while resisting debris perfectly. The steel reinforced concrete won't burn in a wildfire, and the insides stay cool. Won't float away in a flood and can be waterproofed. They surf over earthquakes as self contained uniform units. I don't see zombies clawing their way in either,lol.
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