Depends on the slope and size of the roof as well as how much snow you get, OSB minimum 10 mm thick. C/C trusses 450 mm, otherwise råspontluckor and 600 C/C trusses, much stronger.
If you don't have OSB boards lying around, do as "skutten" suggests and use "råspont." Either planks or running meter. It will be much more durable and easier to attach any "vindskivor," etc.
Hi, I'm going to build a rain shelter for wood (without walls) and I'm considering if I can use tar papered OSB boards for the roof?
works great if you don't make it too wide.
but you need something to mount the OSB on, like a small rafter. preferably support legs down to the ground.