Layer tab on Glazing Dialog.
Set the number of glazing layers first (2 = double glazing), then select the pane and window gas material for each layer. The DesignBuilder glazing data consists of layers of panes interspersed with layers of window gases. Summary derived data for the overall glazing system such as internal and external surface heat transfer coefficients, U-values etc can be found on the Calculated tab.
Note: Low emissivity glazing systems can be defined by specifying an appropriate 'LoE' Pane type for the Innermost Pane. You can find some typical low emissivity panes under the 'Clear ' Panes category.