What is the R-value of stucco and how does it compare to other insulation materials?

The R-value of stucco typically ranges from 0.2 to 0.5 per inch of thickness. This is lower than most other insulation materials such as fiberglass or foam board, which have higher R-values ranging from 3.0 to 7.0 per inch. Therefore, stucco is not as effective as these materials in providing insulation against heat transfer.