Framing, or getting the "sticks up," is started about a week after the concrete foundation is poured. Sheathing, or plywood sheets, are placed on top of the wall framing. Framing the walls is done by a rough framing carpenter, and the trusses/fascia/roof are completed by a more specialized crew.
Most roofs today are supported by pre-made engineered trusses. The roof tiles are placed on the roof as soon as the roof sheathing is put down. We want to get the roof tiles up as soon as possible because the weight will help to settle the structure and avoid stucco cracks.