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The R value of a material is the thermal resistance of the material, so is dependent on the material's thickness. R is also the inverse of a material's thermal conductivity U.
To work it out you need the k value ( the thermal conductivity) of the material and the thickness, then R=thickness/k.
The k value for structural concrete (of density 2300kg/m3) is 1.6 W/mK (Units: Watts / (metre x degrees Kelvin) so for a thickness 100mm (0.1m) of this concrete, R=0.06 m2°C/W.
Note that the R value in imperial units will not be the same. Check the units for any R value of any material that is given.
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Does concrete have an R value. 8 inches is equal to about a single pane of glass. Not much at all...?
Yes. Don't know for sure but its pretty low. however note that R value depends on the thickness. You double the thickness you double the R value.
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