Fill a pair of stockings with calcium chloride ice-melting pellets by scooping a handful in at a time, tying each leg off every 4 inches to create separate pockets of the pellets. Tie the stockings at the waist.
Use a ladder to access the roof and place the stockings 2 feet from the roof’s edge, just above the ice buildup. Place a pair of calcium chloride-filled stockings every 3 feet across the roof. Depending on the ice buildup, though, using a ladder can be dangerous. The alternative method is to simply toss the stockings onto the roof as close to the recommended placement as possible.
Wait for the calcium chloride to break down the ice buildup and melt the icicles. Calcium chloride melts faster than other ice-melting solutions and withstands lower temperatures. When all of the ice has been melted and temperatures warm up again, use a ladder to access the roof and remove the stockings.