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Paul Hansen

Gleb from Insulpro is a wealth of knowledge in this area as well. he once drew a graph for me describing decreasing benefit relative to R-value. This was not a ROI  point of view, but more that in a temperate climate of the Far North his argument was that once we went over a R3.6 type value the thermal benfit nearly started to flatten out at the top of the curve if this makes sense. High thermal value in the first part of the curve up to R2.8, slowing to R3.2 flattening out after R3.6. This would not be relative to a colder zone 2 – zone 3 house.