When it was first drafted in 2000, the International Energy Conservation Code established a model code for states and municipal governments in the United States to set minimum design and construction requirements for energy efficiency. There are many design paths to accomplish the IECC code requirements, including both prescriptive-based, as well as performance-based design initiatives to elevate energy efficiency.
While these codes focused on commercial construction, an alternative for one- and two-family dwellings—the International Residential Code—provides prescriptive energy provisions that can be easily implemented and are consistent with IECC provisions.