Guest lewischisholm@hotmail.com Posted September 19, 2011 Report Share Posted September 19, 2011 What is an R value? I haven't heard of it before. Link to comment Share on other sites More sharing options...
Guest mischief Posted October 6, 2011 Report Share Posted October 6, 2011 R stands for resistance to heat flow and it measures the insulating value of a material. The higher the R, the better. A single pane piece of glass has an R-Value of 1. A double pane window has an R-value of 2. A properly insulated attic will have an R-value of 30. The R-value is the inverse of the U-Value (R= 1/R), which is the statistic that is shown on the film performance charts and are expressed as a decimal (less than one). The lower the U-Value the better. Glass, window and film manufacturers use U-Values. Insulation manufacturers use R-values. Link to comment Share on other sites More sharing options...
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