SECTION 120.7 of Title 24-2013 has "MANDATORY INSULATION REQUIREMENTS" which CBECC-Com checks the modeled constructions against. There are different minimum U-factors depending on the type of envelope element (i.e. wall, roof, etc.) and the type of construction (i.e. metal frame, wood frame, etc.) including "Metal Building" constructions. These minimum U-factors are less stringent, so your modeled construction may exceed the typical minimum U-factor and trigger an error in CBECC-Com, but in reality should comply.

What materials need to be included to get CBECC-Com to recognize the less stringent Mandatory U-factors for Metal Buildings?