Both osb and plywood for the roof have been approved for use so it may come down to what you feel most comfortable using.
Replace shed roof plywood.
Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design.
However if you are already removing much of your roofing material for replacement then changing out the plywood is not much more trouble.
How to replace shed roof plywood.
First cut your rafter boards to size using a circular.
Rafters run from the peak of the roof.
To build a shed roof you ll need rafter boards plywood gusset plates plywood sheathing felt roofing paper and shingles.
Choosing the right type of plywood for the roof is one of the most important construction decisions that you will have to make.
Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component.
It determines how long your roof will last and how well it will protect the contents of your home.