The question isn't whether something will last for 100 or 1000 years. The question is "is it cheaper / safer to get something to last for 1000 years with wood o

The question isn't whether something will last for 100 or 1000 years. The question is "is it cheaper / safer to get something to last for 1000 years with wood or concrete?" And for most buildings wood is far, far easier to maintain. And yeah, moisture is a really big deal. Most of building science is around moisture and heat. Humans and building materials don't like getting too wet.