Not entirely at home with all english building terms, but if I do a google search with some images, I think I would model the fascia and such seperately.
If you need two different composites for the roof, just draw two roofs and use the Merge Elements command to make in to 'one' roof again in terms of connections and floorplan / section display.
Erwin Edel, Project Lead, Leloup Architecten
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