Thickness of surfaces and widths of frames

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Hello Users, I modeled a building in sketch up make 2017 with openstudio plugin. Does the areas and lenghts change, when I add constructions in the IDF Editor? Because my surfaces in sketch up have no thickness. And another thing. I also added windows in my model. When I know add frames, does the area of the window shrink or is this area fixed and the frame is build around? Regards, Arne