University of massachusetts meets most building codes for roof and wall sheathing.
Osb or plywood for shed roof.
Using oriented strand board osb for shed walls floors and roofs.
Both products will swell when wet but plywood will return to almost its exact shape when it dries.
Using oriented strand board is a tested way of reducing costs for building your shed.
2x greater shear strength than similar sized plywood source.
However when it is penetrated by water it takes a very long time to finally dry out compared to cdx plywood.
Alternatively osb is created from wood chips resin and adhesive that is baked and formed into the shape of a sheet of plywood.
Oriented strand board osb is the least expensive option for sheathing the walls and roof of a shed which is why it s used so often for sheds and homes.
Today you can find osb in thickness from 7 16 to 1 1 8 for different applications from roof wall subfloor i joists and everything between.
Even though plywood is more expensive and osb stronger my recommendation for a shed roof is 5 8 or 3 4 construction grade exterior rated cdx t g plywood.
The lower the slope the more weight for snow load but less wind force.
Osb is less forgiving of being left out in the rain and will show more deformities after a wetting and drying cycle.
Plywood will absorb moisture quicker than osb but consequently it will also dry quicker.
Osb is made of chips of softwood glued together in a semi random pattern.
As with plywood osb typically comes in 4 ft.
The higher the slope the more quickly the snow and rain will be shed but also the greater the wind force.