For wood framing it can be 16", 19 1/4" or 24 " on center.
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Rafters are usually on 2 ft. centers.
Rafters are 16" on center. Trusses are 24" on center. Or 450mm & 600mm australia
23
The frame should be checked prior to the rafters going on. Once the roof is on , you will just have to deal with what you have. The horse is out of the barn...
You still need to indicate the pitch, the roof sheathing, and the shingle weight.