Chris Kott wrote:I think it would be more like you'd make a borax slurry and mix the shredded mass in a cement mixer until homogenous. If spots are missed, that cellulose is essentially food for any cellulose-eating microorganism.
I knew that borax treatment was proof against insect infestation, but hadn't heard about, or perhaps forgot about, the issue of its fire retardance. Another good fire retardant is sealing it up on the inside with cob and a waterproofed natural plaster outside, greatly reducing availability of oxygen. Or burying the structure in a thin layer of soil and sod. Or a thicker layer, growing pasture, pollinator food and habitat, and maybe some trees.
I would keep the insulation on the outside of the earthbags. If you insulate outside, the earthbags act as thermal batteries, trapping heat while you're heating, and acting as a heat sink in the summer, keeping it cool. If you insulate inside, you're subtracting interior space for no good reason I can see.
I would love to see pictures of and hear about ongoing or completed projects. To all earthbag adventurers, good luck, and keep us posted.