Layer tab on Glazing Dialog.
Set the number of layers first, then select the pane and window gas material for each layer. The DesignBuilder Glazing data simply consists of layers of panes interspersed with layers of window gases. Other data such as internal and external surface heat transfer coefficients, U-values etc can be calculated and stored on the Calculated tab.
Note that you can define low emissivity glazing systems by specifying an appropriate 'LoE' Pane type for the Innermost Pane. You can find some typical low emissivity panes under the 'Clear ' Panes category.