I think you are overthinking it.
Shed roof rafters 2x4 or 2x6.
Will 2x4 rafters 24 inch on centre hold up my 8 x 12 shed.
If you have a single sloped shed roof then using 2 6 rafters is a better bet because the price differential won t be huge and your shed roof will have a much greater load capacity.
A stick framed roof uses 2x4 s or 2x6 s or whatever you are framing with but has a ridge board running down the middle ridge line.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
The roof will have a 3 12 slope to match my garage.
For standard shed roof rafter spacing see rafter span chart.
There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.
2 x 6 will allow you to properly do soffit facia and overhang ladders.
The roof on this shed is a 4 in 12 slope which makes it a 18 and one half degree angle on the board ends.
A couple of joists or collar ties further up to stop spreading and you re done.
Also available for the android os.
The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope.
Im building a 8x12 shed.
For instance 2 grade 2x4s at 16 on center will span just over 9.
Build gables suspend ridge board install 2x6 rafters w proper birds mouths.
Will a 2x4 rafter 16 oc be fine or do i need to use 2x6 rafters.
If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and.
You then have rafters running down from this ridge board and resting on the top wall plates.
A rafter or speed square will have marks for both of these angles.
Sometimes the rafter will have a tail and extend out past the wall so that you have a soffit or overhang.