Tips for Calcium Chloride on the Roof

Containing Calcium Chloride

• Contain calcium chloride so that it doesn't come in contact with the roofing materials or run off into streams, rivers or other waterways. Some ways to contain the calcium chloride include filling a sock or the leg of a pantyhose with the deicer. Tie the top closed and set it over an ice dam. The calcium chloride will melt the ice and form a channel where melting snow can flow down into the gutters and onto the ground.

Gutter Level

• While containment provides some of the best protection from damage for your roof, placing the calcium chloride just at the gutter level keeps the chemical contained within the gutters. Break a hole into the top of any ice blocks in or directly above the gutters with a sledgehammer. Space the holes about three feet apart. Pour a small amount of calcium chloride into the hole, and when the ice melts it should flow through the gutters.

Safety

• When working with calcium chloride, avoid skin and eye contact. Wear eye protection and gloves when handling the chemical. If the chemical does come in contact with your skin, wash it off immediately with water. If your eyes are exposed to calcium chloride, flush them with water and call for emergency help if any irritation continues.

Other Options

• Since calcium chloride is corrosive and potentially harmful to the environment, choosing another deicer is an acceptable alternative. Gentler, less corrosive deicing agents include magnesium chloride and most deicers labeled as safe for pets, vegetation or concrete. Read labels carefully to determine whether the product is likely to cause damage to your roof. Any product not labeled as safe for concrete is usually too corrosive to use directly on your roof.