Bus Driver is all about driving buses. In Bus Driver, your job is to transport passengers around an attractive and realistic city. You must drive to a timetable on a planned route, whilst obeying traffic rules, and taking care not to upset or injure your passengers.
A typical 4 foot by 8 foot sheet of plywood covers 32 square feet. If your roof area is 1,600 square feet, 1,600 divided by 32 will mean you need about 50 sheets to cover the roof. Add 10 percent to allow for waste.
We figure .64 lineal feet of 2x8 lumber per square foot. That covers standard framing at 24 centers, with some additional materials for ridges, blocking, end waste and headers. Material costs are multiplied by the roof framing spacing adjustment (x2 for 12 spacing, x1.5 for 16 spacing, etc).