Even with 3 inches of packing and sawdust, leaves etc, the R value is
inferior to just 1 inch of XPS insulation. With modern innovations, we get
R=10 for an entire deep box and roof of poly/xps pre cut perfectly for
langstroth frames for $50. That may not be the most "eco friendly". But
for the equivalent insulation value of 10 inches of wood, I think the
eco-tradoff is worth it.
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