What Is A Good R Value For Windows. U-values are the mathematical inverse of R-values. Here are the differences in a nutshell.
Insulation level are specified by R-Value. Clear double glazing has an R-value of 2 about U-05 while clear triple glazing has an R-value of 3 about U-033. By increasing the R-value from 3 to 5 average heat loss through the window is reduced by 30 percent to 40 percent Designed for new construction and replacement projects the windows can achieve a U-factor as low as 015.
Unlike R-values lower U-value indicates higher insulating value.
R-value can be expressed as the unit thermal resistance. Fiberglass blown attic 22 - 43. As a comparison Energy Starrated windows typically hold an R-value of 3. It is a calculation of the conduction properties of various materials used.
