OSB is fine for roof decking as long as it is inside the guidelines (i.e. span). The span is mostly a non issue in your case given the current deck boards as well.
Don't really need the clips for bracing, but spacing is still a good idea in this case.
It is pretty back breaking work. While I prefer plywood, I don't see it being a huge deal breaker here to run OSB. My bigger issue with OSB is some concerns about holding power (information is mixed on this) and that is a complete non issue in this case with the decking layer below the OSB.
They will probably nail down and semi-level the decking boards with just additional fasteners before dropping down the OSB. The new sheathing should conceal all of the waviness if done properly.
Don't really need the clips for bracing, but spacing is still a good idea in this case.
It is pretty back breaking work. While I prefer plywood, I don't see it being a huge deal breaker here to run OSB. My bigger issue with OSB is some concerns about holding power (information is mixed on this) and that is a complete non issue in this case with the decking layer below the OSB.
They will probably nail down and semi-level the decking boards with just additional fasteners before dropping down the OSB. The new sheathing should conceal all of the waviness if done properly.