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Heavy amounts of snow could be a problem. In many climates, lots of snow on your rooftop can lead to freeze-thaw cycle that create ice dams, which can damage rooftops. But if you’re using shingle clips, this snow poses an additional problem: As it melts and freezes, it can easily dislodge clips you’ve placed on your roof.

You can clean snow off your roof after a fresh snowfall while it’s still lightweight, but brushing off snow can also dislodge your clips. If you get a lot of snow, then roof clips become less viable.

While it’s less common than on other kinds of roofs, yes, ice dams can form on metal roofs. Metal roofs, particularly those with snow guards installed, can still accumulate ice at the roof edge, although ice dams on metal roofs are less likely to cause roof or interior damage than on traditional asphalt shingle roofs.

Whether salt melts ice overnight will depend on how low the temperature drops. If temperatures stay around 30 degrees Fahrenheit, you can count on salt melting ice overnight. Otherwise, the lower temperatures get, the less effective the salt is in melting ice, and the more likely you’ll wake up with a slippery driveway the next day. 

Some commercial services use sand when clearing ice, but that’s to add instant traction, not to melt the ice. While you can scatter kitty litter, sand, or similar substances on steps, paths, or porches to improve safety during icy conditions, they won’t help melt hardened ice. Rely on salt or other de-icing methods to fully melt away stubborn ice.