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The rate of heat transfer across an IG unit is measured using "U" and "R" values.

U-Value = Coefficient of heat transfer (BTU / Hour / Foot2 / °)

R-Value = Coefficient of Thermal Resistance (1/U)

The U-Value is a measure of an IG's ability to block heat transfer - lower values of U indicate better insulating performance, and equate to higher R values.

Below are just a few examples of U and R values with various glass make-ups using 1/8" glass and 1/2" airspace where applicable:

Item "U" "R"
Single Pane 1.0 1.0
Double Pane IG .49 2.04
Double Pane with lowE .36 2.78
Pane IG Triple .32 3.13

Let our Technical Services Department help you determine the best unit construction to make your units "green":

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