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Generally, snow removal from a roof should occur once over six inches of snow accumulates, especially if you notice that ice dams have formed. Without ice dams, you can let the snow accumulation hit 12 inches before removing it. However, the amount of snow that is too much for your roof also depends on the sturdiness of your roof and the compactness of the snow. If your roof needs maintenance or has structural issues, it’s best not to let the snow accumulate too much for fear of collapsing.

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.

It is not advisable to use salt on your roof to prevent or remove ice dams. It’s not only mostly ineffective but can also cause serious damage to your roof itself. Salt can rust metal, damage masonry, pit shingles, and cause runoff that’s damaging to plants and animals. 

Snowblowers are some of the best tools for snow removal because they remove large amounts of snow quickly without bodily harm or damaging your deck. If your snowblower can fit on your deck, it’s a good first line of defense to remove snow quickly and easily. If you don’t have a snowblower, a plastic shovel with a rubber blade is another good choice to remove snow on a deck.