It is considered some, if not the best, roofing that is reliable. Now, that doesn't mean it will prevent a roof collapse, it means it is substantially good product to sustain the rigors of extreme cold. Don't cut corners with this stuff.
Owens-Corning Roofs (click here)
The diagram below is that of an ice dam. It occurs when snow melts and rungs down the roof as water, but, then freezes in the rain gutters due to a block or a bend in the drain pipe. It could just get cold again and it starts to freeze, too. But, ice dams are very bad for roofs.
The All State Blog explores the issue of ice dams.Icicles (click here) are commonly thought to be a sign of an ice dam on your roof, but are they? Possibly, says Rem Brown, senior engineering manager at the Insurance Institute for Business and Home Safety (IBHS)
Below is an actual picture of an ice dam. Everyone takes pictures of the pretty icicles and the reflection of the light through them, but, there is a danger in ignoring the impact such a heavy structure has on the roof of the house.And here is a word from the International Association of Certified Home Inspection.
Ice dams are formed by an interaction between snow cover, outside
temperatures, and heat lost through the roof. Specifically, there must
be snow on the roof, warm portions of the upper roof (warmer than 32°
F), and cold portions of the lower roof (at freezing or below). Melted
snow from the warmer areas will refreeze when it flows down to the
colder portions, forming an ice dam....
