Radiant Roof Gutter Heating Cables - Calculating the amount of
radiant heating cable needed for roof de-icing can be easily done by taking a few simple measurements. Measurement A, shown in Figure 1, will always be a constant 2 feet.
Measurement B will range from 1-5 feet, which is the distance from the roof edge to about 6 inches above the
roof eave, where the wall and the overhang meet. The final needed measurement is the length of the roof edge.
Warmzone recommends heating the gutters as well as the roof to prevent refreezing in the gutters,
which can cause structural damage and pose significant safety risks.
Diagram for calculating the proper amount of heating cable for a
roof deicing system.