New IECC provision tightens historic building exemption
The International Energy Conservation Code has been revised to eliminate what has been seen as a blanket exemption for historic buildings. The current “historic buildings” definition has been criticized as too imprecise, and many jurisdictions still apply the IECC selectively to historic buildings.
This confusing exemption to the code means that opportunities for energy savings are missed. In the commercial IECC, the new 2015 code language eliminates the blanket exemption, and now requires the submission of a report detailing why any code provision would be detrimental to the historic character of the building.