I have asked a few questions and I appreciate everyones answers - this site is very helpful.
one more question:
I am putting down a 50 yr arch shingle. It seems like I read that you should use 6 nails per shingle. When I talked with a potential installer, he informed me that they use 4 nails per shingle.
What is the industry standard / correct number of nails? Does the shingle warranty require a certain number of nails