Roof and Gutter Heating Cable

By Robert Robillard on Home Maintenance

Roof and Gutter Heating Cable

Installing Heating Cable in an “in-line” downspout

Because the heating cable is one continuous wire, you will sometimes have to run the cable down a “mid-line” or “in-line” downspout and then back up in order to continue gutter coverage.

To do this, loop the heating cable down into the downspout. We estimate how much wire we need by holding the wire next to the downspout pipe. We then create a loop that will easily reach the bottom of the drain pipe.

To pull the roof and gutter heating cable through the pipe, we run the electrician’s fish-tape up the downspout and pull the wire down.  The fish tape attaches to the heating wire with electrician’s tape. Once attached, we pull the fish tape down through the downspout and then remove the fish-tape.

TIP:  If we need to add or remove wire slack, we simply pull wire “slack,” down or up, depending on the need.

Roof and Gutter Heating Cable

Power Connection

My electrician handles all of the connections to power and mounting of the controller/sensor.

I always factor in the starting location on my installations so the power wires start or terminate in the same location. I try to pick a spot that is easily accessible for the electrician to be able to get his power to the system.

TIP:  Use only UL Listed weather-proof junction boxes for power connection.

TIP: Visually check all power connections, splices and end seals, and then perform a 2500 VDC meggar check. The meggar check is performed at the power connection end of the cable between buss wire and the grounding braid. The minimum acceptable reading is 20 megohms.

Roof and Gutter Heating Cable

Ending the Cable Run                           

When we have reached our endpoint we cut the excess cable and finish off the cut end with a Warmup NAM-END-KIT. This kit ensures a waterproof, electrically safe end connection.

TIP: If you’re nearing the end, and you think you’re running out of wire, backtrack and widen your triangle bases or reduce the height of the triangles on areas of the roof that are less susceptible to ice dams.

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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob If you have a building or remodeling question you can have rob respond to your answer via video. Click here for more information. https://jointruly.com/robillard Invite code: x22r2

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