I’ve been a proponent of earthbag building for well over a decade now. When I tell people what I teach, I’d say that at least 95% of folks haven’t heard of it. The premise is simple: put dirt (a mix of sand and clay) in sandbags and build walls with it. We built our first earthbag house in 2009 and I have been an avid spreader of the dirtbag gospel ever since.