I live in Missouri aka Tornada Alley...and on the New Madrid fault line. Because tornados & earthquakes are something we have considered when building, we have decided to build a round house with earth bags. Unfortunately I am reading these provide little insulation to our cold winters/hot summers. I read in a book it would be possible to cover the exterior of the earth bag home with straw bales. Can anyone see a problem with this? The first thing I wonder about is the moisture issue. I do know I want a large roof overhang to prevent as much rainfall as I can from touching the exterior walls.