I have a rental unit that has a large single slope roof. There is exposed roof decking all around the outside of the house. It is an older place and has been shingled and re-shingled previously.
This has just been re-shingled again, and the nails come through the decking all around the house about 3/4". I have carefully looked at this and it is clear to me that no previous nails have come through in this manner, only the current job.