Hello all. My parents house caught fire about 8 years ago as a result of their wood stove. Everyone was fine and house rebuilt. Now today, I went on the roof to caulk around vent pipes and when I looked over at the steel roof below the chimney I was shocked. I am attaching pictures but it looks like heat is peeling away the coating on the tiles. My father says it is just from creosote but it looks more concerning. Please take a look and see what you think. I can get back up if more images are needed. The dark part is on the downward side of the chimney. Thanks all, have a great day.