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I have a question. I am planning on building a 30 diameter earthbag home within the next year. I am also thinking about using reget sand and adding papercrete, perhaps 50% as an additional binder to harden as a concrete wall plus add insulation. May I have your opion?
I think that you might run into some significant problems with this scheme, primarily related to the addition of papercrete into the mix. It might work if the papercrete is allowed to cure (dry out) completely and then is kept dry for the rest of its life, but this may be hard to accomplish. If you are building vertical walls, then a roof with substantial eaves can protect the wall, but if you are building a dome with the bags, then it is very difficult indeed to assure that the papercrete is kept dry, and the consequences of damp papercrete can be unhealthy mold and inefficient insulation.
Kelly