I was wondering if scoria mixed in with dirt would make a good even insulative wall for an earthbag house. I'm planning to make a 112.5 sq m, two story earthbag house in central germany. I think that with this combination it would keep the solar power use down and keep me warm during the winter and keep it nice during the summer.
Also, kind of off topic, but I was wondering if it would be good to dig the earth down about a foot for the entire area of the house and fill it in with gravel, then once the house in built, I could put lime plaster over the gravel as a floor.
Thanks for any info that could point me in the right direction.