Insulation R-Values Chart

https://docs.google.com/spreadsheets/d/1pHbs23efS-_sbKfYJeZk2z5pJFb3rAV3H-cgj2nSn5M/edit?usp=sharing

Air Spaces (Air Gap)

Air spaces are particularly difficult to estimate values of the R-Value as they depend on numerous factors, including size and shape of the surfaces, orientation, reflectivity of the surfaces facing the airspace, heat and airflow in/out of the airspace (air changes per hour), and other factors.

ICC A9.4.2 Air Spaces

ICC Ashrae TA9.4.2 Air Spaces Has been created to help deal with the difficulty of how to estimate air space values. Note that all air spaces under .5” thick are stated to have zero R-Value.

Air Film (Adjacent to Assemblies)

Air against a wall has an insulative property and is known as ‘air film’. Interior and Exterior accepted values are shown in the chart, and are generally used throughout various textbooks.

R-Value Chart

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