You can use salvaged rigid foam for insulation too, there are companies all over the nation that sell used rigid foam insulation from commercial roofing. Have you done any research into superinsulation? Air Selaing? HRV's? Manual J Calculations? REMOTE, PERSIST building techniques, OVE construction? All things that help make the most energy intensive portion of the home (HVAC) more viable in an off the grid situation.
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