<b>What is the purpose of the heating cable?</b><br/> The roof de-icing cable is designed to prevent ice buildup, known as ice dams, from forming on roofs and in gutters and downspouts. When properly installed and operated, this product creates a path for melted snow of ice (“melt water”) to drain from the roof to the ground.<br/> <b>Why you need to choose HIRD roof heating cable to protect your roof in the winter ?</b><br/> HIRD roof heating cable was approved by both CSA and ETL. You can have more confidence on the product safety. Pre-assemble heating cable make installation easy for do-it-yourselfers with the included clips and spacers.<br/> HIRD owned the aluminum foil and the tinned copper braid to make sure the 100% screen rate to make the product more healthy and more stable.<br/> In the connection, HIRD take the industrial grade heat shrinkage tube technology to make the cable more durable.<br/> <b>How about the manufacturer?</b><br/> The factory meet ISO9001 standard (audit by BV)in the production process and the company take a very strict requirement on the incoming material, production process control, finish good inspection etc. Advanced product structure engineering design, good raw material, strict production process, strict internal management plus many years maneuvering experience make HIRD more reliable.<br/> <b>This kit is only designed for use on: </b><br/> Metal or plastic gutters/downspouts<br/> Inclined roofs <br/> Roofs with noncombustible shingles (Ex.: asphalt shingles) that meet national building codes <br/> <b>Do not use this kit on any other type of roof, gutter and downspout, including: </b> Roofs with wooden shingles, Rubber or rubber membrane roofs, Composite (tar and gravel) roofs, Wooden gutters or downspouts, Flat roofs <br/> HIRD cable cannot be used on slate, stone, metal and ceramic roofs.<br/> These types of roofs require special installation or the use of a self-regulating cable.