What Is The R Value Of A Window. Thats why Canadian manufacturer LiteZone developed these new insulated glass units with up to 8 layers of film and R-values up to R-17. To calculate the R-Value you must first determine the U-Factor of your window or patio door unit.
A standard Aluminum blind in a double glazed window carries an R-value of 232. B U-factor is a measure of the rate of heat flow through a window. 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 U-factor is a measure of heat flow or conductivity through a material the reciprocal of R-value.
This is how a right window treatment gives a positive impact. A typical insulated wall has an R-value anywhere from 12 to 19 while a double-pane window has an R-value of about 2. As a benchmark one inch of solid wood has an R-value of 1. This may sound like a low insulating value but even the finest energy efficient windows today carry U-values hovering in the 22 through 30 ranges.
