Roofing Repair cost over Ridge Vent?

Shingles do sometimes blow off of roofs. A hip roof is a kind of roof. It will take a very long time to explain everything and to answer all of your questions. You do want to have it fixed before you have water intrusion damage. He sounds like he's on the up and up. But just like a doctors diagnosis. Get a second or even third opinion. Try asking for references you can contact. Someone who's legitimate won't be afraid of you calling his previous customers.