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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.

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.

Snowblowers come in three different sizes: first-, second-, and third-stage blowers. Each additional stage is larger with higher intakes, more powerful, and has more gear options.

A first-stage blower, also called a snow thrower, is usually best for snow 6 to 8 inches or below. Electric snow blowers are usually only available in this size. If you regularly get snow that’s well above six inches, consider a second-stage snow blower. If snowstorms dump 2 to 3 feet of snow repeatedly during winter, you need a third-stage snow blower to tackle it.

Ice dam removal is costly, but it’s absolutely worth it. If you leave an ice dam as is and don’t take care of it, you’re looking at potentially dangerous situations and high-cost repairs—like roof collapse, leaks, mold problems, gutter damage, and more. Removing ice dams is essential to keeping your home and your family safe in the snowy season.