Hello EIM123,
The typical answer is NO. But of course, there are always exceptions...
WINDOW objects should never be modeled with a thickness, because there is certain glazing properties assigned to the single layer object. If you were to "double up" on the layers, it would be the same as having two windows. Just make sure that the transmittance is set to 1.0 while running thermal analyses, with the SHGC set to what the manufacturer's specification: these two options work the same way in that they both decrease the solar radiation, so if setting both of them as per your manufacturer's specifications, you would be reducing the solar gains by too much.
WALLS, FLOORS and CEILING objects typically do not need to show any thickness for most analyses, as the assembly and actual thickness of each object is defined in the Layer tab of the Material Properties window, which Ecotect accounts for; but sometimes, especially for daylighting studies, the thickness of the walls around your glazing will reduce some of the incoming light. This can be easily modeled without "doubling up" the walls by simply creating reveals objects on the outside of your windows:
In that way, the light will be blocked from entering the space the same way it would with the thickness of the walls. IN most cases, it will only reduce the daylighting by a small fraction, so I would first make sure that the daylighting results look correct with a simpler model, then little by little, increase the level of detail for the model, which may impact the overall light levels (reveals, columns, furniture etc...)
For your example, simply assign the Transmittance to your single plane WINDOW object; SHGC is only useful for thermal analyses, so it will not matter for daylighting analyses.
Hope that helps,
Cheers,
