Thin Glass to Change High-Performance Window Market

The good news about window performance is that the market has been transformed by the building industry moving to dual-pane, low-e, argon-filled glazing with performance around R-4, according to Lawrence Berkeley National Laboratory (LBNL). See Figure 1 in the slideshow.

The bad news is that since around 1990, the performance of the vast majority of our windows has not really changed much. See Figure 2 for a current breakdown of the market based on performance of windows rated by the National Fenestration Rating Council (NFRC).