The spacing of rafters in a roof is 48-in o.c. Roof dead load = 5 psf. Snow load=30 psf. Roof sheathing is to be a sheathing grade of plywood, and panels are oriented in the strong direction. Deflection limits are L/240 for snow load and L/180 for total load. Find: The minimum span rating, thickness, and edge support requirements for the roof sheathing using ASD procedures.