Our roofer urged extensive use of ice and water shield this past summer. A bit pricy but hopefully worth every penny. Metal roofs are great, but.... Our chalet has the main entrance under the sloped-edge of the roof. When the roof was covered in asphalt shingles avalanches were never an issue. But now with a metal roof....disaster city. An 8-foot deep deck runs along that side (front) of the house with the front entrance in the middle. The snow avalanches wiped out the deck rail lattice work the first year. They can also actually block the front door. If we were going to keep the house long-term we'd make some kind of roof modification, though we were told that doing so would void the warranty on the metal roof.
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