The U.S. Department of Energy specifies energy codes, including insulation R-values, that are based upon geographical climate zones (see map below): click here for the US DOE 2018 Residential IECC document.
These are the insulation requirements for each climate zone, according to the “Residential Provisions of the 2018 International Energy Conservation Code”:
There are a number of allowances, exclusions, and special cases accounted for in the document above, and you will want to look at the respective energy code for your state. Also, many cities and even some other counties, townships, and regions may have different code requirements and/or incentives.
Click below for the code for a specific state (and let us know if we need to update something!):
- Colorado is a home rule state, thus check with your city and county regarding energy codes for residential and commercial buildings
- Michigan Residential Energy Code
- Minnesota 2015 Amendments to 2012 IECC
- Nevada adopts 2018 IECC with Amendments
- Oregon Residential Specialty Code
- Wisconsin Energy Conservation (Chapter SPS 322)
We are in the process of adding documents for all the states… check back, or contact us!