Our company policy is to always nail through double thickness, has been that way before I have been around. Now when we go back, 30years later, l and sell the same customer there next roof all the shingles are right where they were when they were installed.
Yes it’s a pain in the ass sometimes and takes more precision and patience…but that’s also why we charge more than guys using cheap subs.
We have some company in the area advertising on the radio for the past few weeks “all roofs done in one day”, like they are a carpet company or something. Just my opinion but that is not the advertising stagarity I would go with. Quality work takes time.