What Are Heating Cables for Roofs?
Heating cables for roofs are commonly referred to as heating coils, roof deicing cables, or heat tape. All of these systems serve the same purpose: helping reduce ice dam formation during winter.
These cables use electricity to generate controlled heat, which melts narrow channels through snow and ice on the roof. The goal is not to clear the entire roof, but to create pathways that allow melting water to drain safely into gutters and away from the home. When water can escape properly, it is less likely to back up under shingles and cause leaks or interior damage.
It is important to understand that heating cables are designed to manage water flow, not to keep roofs or gutters completely snow-free.
How Effective Are Heating Cables in Ottawa’s Climate?
When installed correctly by a qualified professional, high-quality heating cables for roofs can help reduce ice dam issues in certain situations. However, during roof inspections across Ottawa, we often see homes that continue to experience ice dam problems despite having heating cables installed.
The primary reason is Ottawa’s extreme winter climate. Heavy snowfall combined with prolonged cold temperatures means that large volumes of snow simply cannot be melted by heating cables alone. These systems are intentionally designed to operate at safe temperatures, as excessive heat could damage shingles, roof membranes, or gutters.
As a result, heating cables may offer limited protection during severe winters, especially on roofs with underlying insulation or ventilation issues.
More Effective Long-Term Solutions for Ice Dams
In many cases, improving attic insulation and ventilation delivers better results than relying solely on heating cables for roofs. Proper insulation helps prevent heat loss from the home, while adequate ventilation keeps roof temperatures consistent. Together, these improvements reduce the freeze-thaw cycles that cause ice dams in the first place.
In more severe situations, homeowners may need to consider re-roofing with a high-quality ice and water protection membrane, such as Grace Ice & Water Shield. This added layer provides extra protection against water intrusion when ice dams do occur.
Our Recommendation
Heating cables can be part of an ice dam prevention strategy, but they should not be viewed as a complete solution, especially in Ottawa’s climate. Addressing insulation, ventilation, and roof protection often provides more reliable and long-lasting results.
If you are experiencing recurring ice dam issues, a professional roof inspection can help determine the most effective approach for your home.
