Thanks for your comments.
I have checked the errata and, although there are lots of other corrections to Chapter 6, there is nothing that answers my questions.
For the time being I'm going to assume the Load Cases represent worst case lift and suction, although from an aerodynamicists point...
2 questions:
1. Does anyone know the meaning of Load Cases A & B, for which pressure coefficients are listed in Figure 18A?
2. Should the pressure coefficients contained in Figure 18A be multiplied to the projected frontal area of the roof i.e. A*sin(theta) to get the load, or the roof area...
