For roofs that will experience heavy snow or wind and will span the same distance use 2 6 rafters.
Roofing with 2x4.
He says lowes told him he could use 2x4 for rafters with 1 2 inches plywood for asphalt shingles.
The roofing is manufactured in panels that.
Rafters to 2x4 with joist hangers.
The rafters are 18 foot long without beams or trusses garage 28x40.
If you have a simple gable shed roof then using 2 4 rafters makes more sense unless you have a very large shed.
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.
For roofs that won t experience heavy snow loads a gable roof can span up to 22 with 2 4 rafters.
Sometimes the rafter will have a tail and extend out past the wall so that you have a soffit or overhang.
The back of the roof will attach to house with 16 2x4 and lag screws.
Front and sides will sit on deck on a 2x4 wall with studs 24 oc and screened in.
Tin roofing also known as metal roofing is considered more durable than composition or wood shingles.
He s already got the 2x4 up for rafters and it s ready for laying plywood tomorrow.
I told him plywood and asphalt shingles would be too heavy.