I would contact the manufacturer of several products to get the exact specifications if you are THAT concerned. Don't take someones word from a board. They don't know the statistical testing of these products for fire codes. I have heard that fiberglass are now better than asphalt "in general". I know nothing about the fire code ratings. I would think one is as good as the next. Just don't get a substandard product. As long at their made by a reputable manufacture and are guaranteed 30 years.