The roof framing is pre-fab trusses, 6/12 slope. The fascia is 2 x 4. The window is installed with a pc of rubber water barrier that will be trimmed to correct length when the vinyl siding is installed. It's purpose is to direct rain that is driven past the vinyl siding and runs down along the tyvek covering. The rubber sheet will be cut to overlap the top of thevinyl siding pc that runs just below it, channeling the infiltrating water thru the weep holes in the siding and back to the outside surface.