An extremely high performance glazing system is now available for both Domus and Aldus windows from Rationel. The Silverstar Deluxe system can achieve a mid-pane U-value of 1W/m 2K, compared with 2.6 to 2.8 of a standard double glazing. One pane of low emissivity glass, Silverstar, in a sealed unit of Argon gas between two panes, allows this impressively low value. The units also come triple-glazed (mid-pane U-value 0.6W/m 2K).
These special units complement the low U-values of 1.6W/m2 kinherent in the timber frames of Rationel's window system.