The attached plan has an existing truss roof that I am attempting to add a conventionally framed addition with open rafters. CA will frame the main part but will not frame the roof over. When I manually replicate rafters over the existing trusses the frame through the trusses. I added a Truss plane but no luck. If I trim to the valley boards CA added the tails penetrate the roof plane.   In a real roof over the existing roof remains and the rafters die into a 2x6 laid flat on the existing p