I think you have something there. Near R-38 for a 2x4 wall. Layered radiants have a lot of potential. The bubble wrap thing is different. Space is an extreme environment, super cold but the sun is super hot. Shade: -148°F (-100°C); Sunlight: 248°F (120°C). It makes sense they would use a heavily insulated radiant barrier. Would it turn your house into a giant faraday cage?
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