Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones.
Shed roof osb thickness.
The typical thickness range for sheathing is 3 8 to 3 4 inch.
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Using oriented strand board osb for shed walls floors and roofs using oriented strand board is a tested way of reducing costs for building your shed.
Osb is fine all the way around.
Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.
8d ring shank nails should be used instead.
7 16 will be fine for 16 on center and 5 8 for 24 on center rafters.
Good enough for houses good enough for a shed.
A flatter roof with rafters farther apart may need a thickness of up to inch.
Keep in mind that the load of the roof still plays a role in the plywood thickness.
The osb thickness will be based on the rafter spacing.
For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load.
When this is the case experts recommend a 5 8 inch thick sheet.
What size plywood for the roof.
Plywood with similar properties currently costs about 30 more for an equivalent thickness.
Never attach roof sheathing with staples.
Thicknesses range from 5 16 to 3 4 inch and the proper one to use.