Building a detatched garage and got the tar paper down last weekend. Of course last night we had a thunderstorm roll through with 50 mph wind gusts, which promptly peeled up the next to top row of the tar paper. I assume I now have water underneath the tar paper below that area. Do I just not worry about it and let it dry out for several days before shingling? How is that normally handled, since I have seen the same thing at construction sites? Obviously that section needs to be replaced, but what about the stuff lower down on the roof. Sheathing is OSB if that matters. Also, how dry do things need to be for shingling? I assume you don't want any moisture under the shingles, but in a practical sense, how do you deal with the daily storms in the summer? If I shingle part of the roof one day, do I need to cover the top edge to protect from water getting underneath until the job is finished? Thanks! Craig

Is it possible to do this with the snap seam metal over old shingles on my barn roof or inadvisable?? Thanks Also, are these easy to install myself?