A lack of rain resistance won't kill you suddenly. If mud brick or cave technology were so amazing, we'd all be living that way still. A better way would be to

A lack of rain resistance won't kill you suddenly. If mud brick or cave technology were so amazing, we'd all be living that way still. A better way would be to build structurally-sound, partially underground to moderate seasonal temperatures, against wind, hail, and forest fires, and placed to prevent floods.