Fill the leg of a pair of pantyhose with calcium chloride pellets.
Tie the leg off every 5 inches, creating separate compartments of calcium chloride pellets up the leg.
Repeat for the second leg, and tie the pantyhose off at the waist. This is one snow and ice melter.
Repeat steps 1 through 3 so that you’ll have one snow and ice melter for every 5 to 6 feet of the snow- and/or ice-covered roof.
Access the top deck via ladder, or door, if applicable. Place the ice melters every 5 feet. The legs should be 180 degrees from each other (creating a straight line), with one foot hanging off the edge of the roof or deck, over a gutter if possible. The compartments of calcium chloride will slowly melt the snow and ice on the roof, and the runoff will trickle down the gutters and/or drains.