Interesting question. An R-value is a measure of the resistance a particular material has to heat flow. It is the inverse of the material’s conductance value (C-value). So, the more resistant a material is to heat transfer, the lower the conductance and vice versa. Here is a website which shows different possible roofing material’s R and C-values. http://www.roofhelp.com/Rvalue.htm
An R-value is a measurement of a material’s heat resistance. The higher the R-value of a material, the more insulation that material provides. R-values are important in roofing, and many states require certain levels of heat resistenance on buildings.
R-values measure insulations’ ability to resist heat. Here is a web site with R-value facts and a table of r-values.
The R value is a measure of thermal resistance used in the building and construction industry. It is a measure of insulation’s heat loss retardation under specified test conditions. It is the ration of the temperature difference across an insulator and the heat flux. The bigger the number, the better the building insulation’s effectiveness. R-value is the opposite of U- value.
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