If you have a simple gable shed roof then using 2 4 rafters makes more sense unless you have a very large shed.
Roofing with 2x4.
Rafters to 2x4 with joist hangers.
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.
Sometimes the rafter will have a tail and extend out past the wall so that you have a soffit or overhang.
Front and sides will sit on deck on a 2x4 wall with studs 24 oc and screened in.
He says lowes told him he could use 2x4 for rafters with 1 2 inches plywood for asphalt shingles.
Installing wood stripping under a tin roof.
You then have rafters running down from this ridge board and resting on the top wall plates.
The back of the roof will attach to house with 16 2x4 and lag screws.
He s already got the 2x4 up for rafters and it s ready for laying plywood tomorrow.
For roofs that won t experience heavy snow loads a gable roof can span up to 22 with 2 4 rafters.
For example if your roof measures 10 feet 3 0 m x 10 feet 3 0 m and the slope of the roof is 12 12 giving a slope factor of 12x12 12x12 12 converts to 1 414 in decimal form you would multiply 10 x 10 x 1 414 to get the total of 141 square feet of roofing.
I told him plywood and asphalt shingles would be too heavy.
Tin roofing also known as metal roofing is considered more durable than composition or wood shingles.