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Roof & Gutter De-icing

Buildings are susceptible to damage caused by water freezing. Primarily, this involves structural damage due to the weight of ice and snow building up on the roof.  Water damage occurs when rooftop snow and ice melts then re-freezes under shingles. Occasionally, structural damage occurs when gutters collapse under the weight of accumulated ice buildup. Chromalox CPR and Thermwire Melt heating cables are designed to prevent ice buildup in gutters and downspouts.

Use of Heat Trace in the Application:

CPR and Thermwire Heating Cables can be used on roofs and in gutters to prevent Ice Dams and provide a path for the melt water to evacuate the roof surface and are specifically designed for roof and gutter de-icing applications.  The cables are not intended to completely melt the snow and ice from a rooftop.  Rather, they are designed to maintain an open path for water to drain during a thaw/re-freeze cycle.  Equipped with UV resistant jackets, the cables utilize self-regulating technology to provide 5 W/Ft on 120V or 240V when in air at 50F. When immersed in snow and ice, they respond by increasing their output to 12 W/Ft.

Important Design Notes/Best Practices:

Consider the following when choosing a roof and gutter de-icing system:

A ground fault protection device is required by NEC to minimize the danger of fire if the heating cable is damaged or improperly installed. A minimum trip level of 30mA is recommended to minimize nuisance tripping.

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