Quick Reference: R-Value Table for Insulation
And Selected Building Materials
To learn more about R-value, see Roof Online’s R-value page.
The following table provides typical R-values for various materials. These R-values were taken from manufacturer technical data sheets and are the reported R-values per inch of actual products. In a few cases, the R-values we give were taken from a non-manufacturer source that we consider to be trustworthy and accurate. In all cases, this table is intended as a general guide to insulation R-values. When calculating the R-value for a real-life installation, always refer to the manufacturer's data sheets for the actual, specific product you intend to use, or contact the technical department of the product manufacturer or material provider.
R-value is used in the United States. RSI is the metric equivalent. To convert R-value to RSI, divide the R-Value by 5.67826. To convert RSI to R-value, multiply the RSI by 5.67826.