Pumice Scoria Earthbag Walls

If you live where either pumice or scoria is available, building the walls with up to 50 percent of either of these, with the balance of the mix compactable dirt, may add a degree of insulation. We've made both rammed-earth pumice bags and slurried adobe/pumice bags at a 50:50 ratio of binder to pumice (see "Insulated Earthbag Foundations/Stem Walls" in Chapter 4). These bags could just as easily be used to build whole walls, as they are still solid and strong, but weigh only 60 pounds (27.2 kg) as compared to the usual 90-100 pound bag (41-45 kg).

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