This building designation and difference in required insulation doesn't make a lot of sense to me. Both appear to require cavity insulation as well as continuous insulation. That implies that there is a framing cavity in both. If a metal building is a structural steel superstructure, like a PEMB, with structural steel columns, girts, beams, etc., are they not often constructed without traditional framing cavities? Does the energy code now disallow that? If a metal framed building is a building with all light gauge, cold formed, repetitive members without a structural steel superstructure, it naturally has the cavities. If both have cavities and cavity insulation (of the same R-value), why the difference in the continuous insulation value?
The descriptions I offer and it seems others as well make sense to me, but they really should be defined, maybe that would help eliminate my confusion. I may have the opportunity to ask some of the energy guru's this week, I'll report if I gain any useful knowledge.
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