Thank you very much for your response! Our main concern is that the roof will function properly and not lose any life due to the ripple. You are very correct that I didn't specifically examine the roof prior to the replacement so it could well have been on the original. Is the roofing in the rain not much of a concern? I have heard so many bad things from people about that in the last 2 weeks and they've got me feeling uneasy. But in Oregon, if people didn't roof in the rain, they would only have about 3 months to work each year.
Also, I don't know roof lingo at all. When you say it could be the "overhang", is that the same thing our roofer mentioned when he refers to the "rafter"? Sorry if that's a very silly question!