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More details on the double wall:
Besides doubling the attic insulation, I framed and insulated another wall right inside the existing wall, so there is:
wooden siding | fibreglass | drywall | fibreglass | drywall.
When it was 20F, the inner drywall was cold to touch, now it is just a bit cool. The whole wall is probably about a foot thick now. This is more effective than just one thick layer of fibreglass, and doesn't require any demolition. It has more "thermal mass" and is much quieter also.
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