The International Code Council (ICC) published the latest edition of the International Energy Conservation Code (IECC) in 2021. The IECC is the model energy code used to establish minimum standards for energy-efficiency in buildings, and is updated every three-years. 
 
The current energy code adopted by the State of Georgia is IECC 2015 whereas, the State of Tennessee adopted IECC 2012. Remember, energy codes can differ by jurisdiction - state, county, and municipality. Therefore, it is highly recommended that you check the local building codes of the roofing project, before determining the amount of insulation required to meet the code.

IECC CLIMATE ZONE MAP

Please keep in mind, if and when states adopt editions 2018 and 2021 of the IECC, it could cause significant changes to all aspects of the roofing systems design.
 
For example, the 2018 codes states, “Continuous insulation board shall be installed in not less than 2 layers and the edge joints between each layer of insulation shall be staggered.”  A single layer of insulation will NO longer be acceptable in accordance with this newer version of the code. 
 

2018 IECC CHAPTER 4 COMMERCIAL ENERGY EFFICIENCY

 

 

 

2021 IECC CHAPTER 4 COMMERCIAL ENERGY EFFICIENCY

 

This change within the code is meant to increase the energy efficiency of the building envelope. Thus, reducing the overall energy cost to heat and cool buildings. 

Have Questions?

If you have questions about your specific project design requirements or need assistance navigating the energy code, contact LSG or Dave Pratt.