Exterior insulation helps to make more efficient use of earthbag mass by creating an air buffer of resistance to extreme external temperature changes. Here we offer a few techniques for attaching various insulative materials to earthbag walls, from minimal R-values for moderately cold climates to mega-insulation for long, bitterly cold winters.
snaplines along face of foam to locate crown of bags
snaplines along face of foam to locate crown of bags fasten foam with galvanized deck, screws 2" - 2.5" deep fasten foam with galvanized deck, screws 2" - 2.5" deep
Use plastic roofing-washers or wind locks over screws for the most secure connection
17.7: Prepping and attaching rigid foam insulation onto an earthbag wall.
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