If you mean glazing, as in windows, it's easy.
- Create a material "glass" with the thermophysical properties of glass.
- Create a surface "window" that specifies the thickness of the window and makes reference to the material "glass". You can also make it almost transparent, and give it a blueish colour for a glass-like appearance.
- Create obstructions to represent the glass and apply the surface property "window". If you are importing a 3D CAD or Revit file the windows are usually grouped as "glazing".
See the example below.
Dave
&MATL ID='GLASS',
SPECIFIC_HEAT=0.84,
CONDUCTIVITY=0.76,
DENSITY=2700.0/
&SURF ID='WINDOW',
RGB=102,255,255,
TRANSPARENCY=0.2,
MATL_ID(1,1)='GLASS_MATL',
MATL_MASS_FRACTION(1,1)=1.0,
THICKNESS(1)=0.005,
GEOMETRY='CARTESIAN',
LENGTH=0.0,
WIDTH=0.0/