I was curious. I just had a roof done and the fellow thought he did a great job. I had all the material as hubby and I were planning on doing it ourselves then changed our minds. I asked him to install to specs, I had ice & water, silver, drip edge etc. The roof is done, there are numerous nails 1/8" to 1/4" off roof deck, some coming through where the main traffic was, the underlayment was not laid properly, some areas of the deck you see wood, some areas you don't, you see it over the drip edge in some areas, 1" from drip edge in other areas, not at all in other areas ... on the rake sides.
My biggest concern is he has numerous cut pieces overlapping and within the run of rows .. he said that with these shingles you can do that ... I am saying I don't think so. I always thought that the only cut pieces should be at the rake ends, everything else is factory cuts butted. OC says 4 inch stagger and there is no attention to this at all. I see seams less than 4 inches and nails exposed in some of those seams.
Nails are above the Surenail strip and below. On the rake sides his nails are too far in. One area his nails are 5 3/4" from the drip edge edge .. and there is no underlayment at that point. I see this flap as a great wind catcher.
I am concerned about leaking but he thinks I am being anal and he claims his roof will never leak. I have my doubts. I will post photos when I get back home and the reason is ... he claims he did a great job. He didn't do a great job and I think he needs to hear it from others in the trade. Maybe then he will believe it.