23
Rafters are 16" on center. Trusses are 24" on center. Or 450mm & 600mm australia
For wood framing it can be 16", 19 1/4" or 24 " on center.
You still need to indicate the pitch, the roof sheathing, and the shingle weight.
Rafters are usually on 2 ft. centers.
The recommended spacing for 2x6 rafters in a roof structure is typically 24 inches on center.
23
Rafters are 16" on center. Trusses are 24" on center. Or 450mm & 600mm australia
For wood framing it can be 16", 19 1/4" or 24 " on center.
If you had a 4/12 pitch and the ridge was running the 20' direction and you were planning on a 12" overhang, your 2x6 rafters would be just shy of 9'-6" each. If your framing is 16" on center you will need 34 of them.
You still need to indicate the pitch, the roof sheathing, and the shingle weight.
I would check the facia board for nail heads. The rafters/trusses are 16" or 24" o.c. If you can find protruding nail heads in the facia and measure the distance between two of them, you can determine where the rest are.
Roof joists are horizontal beams that support the ceiling and the weight of the roof, while rafters are sloped beams that support the roof itself. Joists are typically found inside the building, while rafters are located on the exterior.
You can see the rafters of the roof very clearly here.
At the peak of the roof where the rafters meet instead of the rafters meeting each other, there is a beam between them that they rest against. It runs the length of the roof peak.
The maximum span for 2x6 rafters in roof construction is typically around 9 feet.
To seal the ridge from weather. If a ridge vent is used it is just that, a vent for the roof.