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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. 

The process to winterize your landscaping depends on the plants you have, but generally speaking, you should rake your lawn to avoid leaves from smothering your grass and leading to mold and fungi growth, wrap young trees to protect from fluctuating temperatures, and fertilize your lawn to provide some nutrients for the grass through the colder temperatures. You can also consider marking off small trees and shrubs to avoid accidentally damaging them with snow removal tools.

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. 

You can use hot water to melt ice from your driveway, but there are some serious caveats. Very hot water can quickly melt ice and remove it, which is helpful if you’re very short on time and need a solution ASAP. However, it will only work across a small area, after which there’s a chance the water will freeze again. The sudden clash of temperatures is dangerous for fragile materials, notably windows and other glass, so you’ll want to keep the water away from your car.