Check with your local concrete contractors to see if any of them do aircrete (aerated concrete). If so, you could have the aircrete poured between the wall layers and not only have insulation, but 100% wind and water protection. But the best part is, that stuff is fireproof! The lighter the mixture (more infused gases), the weaker it is -- as in, you can't use this "AS" a foundation in your garage or shop. You could, however, pour an aircrete slab with concrete footings, then have full-strength concrete over that. As for the walls, the lightest material can be somewhat fragile, so it'll be best to do as you planned and keep that inside layer of metal siding, or other (wood, drywall, etc).
If you have access to LOTS of shredded paper, you could also make papercrete. When making that, mix boric acid into the mix and it will be fire resistant also.
.....Or, you could just go the normal route and use commercially available insulation. :wink:
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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