Going to start laying plywood and shinlges. If for some reason i can't get the shingles done because of weather. Will the plywood be ok till spring if i just leave it. Can i put felt paper to help prtect it some.
Roof it as soon as you lay down the plywood. Regular asphalt felt can not be exposed to weather for very long especially in Northern Illinois. With the nice weather we have been having around this area, there is no reason why I dont see you being able to get the whole project complete.