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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. 

Both rock salt and ice melt are naturally occurring salts. Rock salt is sodium chloride, which is the same as table salt. Ice melt products can be made from a combination of salts like magnesium chloride and calcium chloride or can be those salts alone.

Rock salt comes in large crystals, so it helps provide traction on icy surfaces, whereas ice melt products need to be mixed with sand to provide traction. Ice melt products work at lower temperatures than rock salt, so they might be a better choice if you have a harsh winter climate.

When temperatures drop far enough, even rock salt can’t melt the ice. The briny solution freezes before it develops, and the salt doesn’t work, which happens around 10 to 15 degrees Fahrenheit. Keep in mind that wind chill and other factors impact ice-melting progress. Some ice melters, like magnesium chloride, work at colder temperatures and work better for deep winter freezes.

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.