Historic gains for efficiency in existing buildings are one of many updates that have been approved for the 2015 International Energy Conservation Code (IECC). The IECC is reviewed and updated every three years and serves as the model energy code for states and local jurisdictions across the United States.
“The updates related to existing and historic buildings clarify and further extend the code’s impact on the current building stock and will mean large energy savings growing over time,” said Jim Edelson, New Buildings Institute (NBI) senior manager of Codes and Policy. NBI and its partners put forward some two dozen proposals.
Edelson summarized the top five outcomes from the hearings from his perspective.
Big Changes for Existing Building Codes
The IECC applies to both new buildings and work done on existing buildings. While it’s pretty obvious how the provisions of the code applied to new buildings, how they were applied to existing buildings was confusing. The provisions apply differently depending on whether the project was an addition, an alteration, or just a repair, and this created confusion for compliance and enforcement.
Code officials and local government representatives voting in Atlantic City approved a new chapter in the IECC that has dedicated sections for additions, alterations, and repairs based on work by an International Code Council (ICC) Code Action Committee and the Northwest Energy Codes Group. The sections of the new chapter clearly define the activity types and describe how the provisions of the code apply. The Northwest proposal that was also approved adds further application guidance and enhanced requirements for many of the activities that are performed on existing buildings.
Historic Buildings Redefined
The IECC, International Existing Buildings Code (IEBC), and the International Property Maintenance Code (IPMC) all address historic buildings. The definition in the IECC was worded in a way that completely exempted historic buildings from every provision of the IECC. The current ‘historic buildings’ definitions in these three codes differ markedly from each other, and from the International Building Code (IBC). Although many jurisdictions still apply the IECC selectively to historic buildings, this confusing exemption to the code creates a huge missed opportunity for energy savings.
Working with the American Institute of Architects (AIA), Preservation Green Lab (PGL), the Washington Association of Building Officials, the Natural Resources Defense Council (NRDC) and the Institute for Market Transformation (IMT), NBI clarified the definition of “Historic Building” and reasonably limited the exemption in the IECC. All five proposals were approved and will be in the 2015 I-Codes. In the case of both the commercial and residential IECCs, the new 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.
Better Controls for Lighting and Daylighting
NBI assisted in the development of measures that will increase the mandatory installation of occupancy sensors and daylighting controls to many new types of spaces in areas not covered by the 2012 IECC, including warehouses and lounge rooms.
In addition, a provision has been added that details how all of the lighting controls must be commissioned. Independently, the IALD successfully introduced a measure that will reduce the LPDs for most types of spaces in commercial buildings.
New Technology Applications for HVAC Systems
There was successful adoption of an important code change addressing high economizer failure rates in new commercial rooftop-type air conditioners. The measure requires that all air-cooled, direct expansion HVAC units (including variable refrigerant flow products) be equipped with a fault detection and diagnostics (FDD) reporting system. This applies to units 4.5 ton or larger with an economizer and says the fault reporting system must be accessible by day-to-day operating personnel or on zone thermostats in the building. The IECC measure was tailored from the California 2013 Title 24 code requirement and reinforces the same minimum system size threshold for the required FDD thereby making it a virtual national standard.
In addition, Dedicated Outdoor Air Systems will be available in the 2015 IECC as a compliance option for the ‘options packages’ for the first time ever in an IECC code. These efficient systems use a mechanism to condition a space that is independent of the system providing ventilation thereby maximizing the energy efficiency of each.
Close Counts In Horseshoes, But Not Building Codes
NBI was a key sponsor, along with various allies, of three groundbreaking measures throughout the IECC development process. These measures addressed commissioning of building envelopes, providing for “solar-ready” space set aside in buildings for solar or other renewable energy systems to be installed at a later date, and an “outcome-based” methodology for using energy consumption data to comply with International Code Council’s (ICC) Performance Code. Each of these three measures received enough votes (a simple majority) to move to a final action vote on code-ready language. However all three of these proposals fell short of achieving the necessary two-thirds majority for final passage by just ONE vote.