A typical 120 foot long roof edge with 6 12 overhangs and no gutters deicing will need about 291 feet of cable.
Roof ice melting cable.
Roof de icing cable kit can be used to keep gutters and downspouts flowing and help prevent ice from forming under the edge of your shingles.
The kit comes with all the clips and spacers you need to install the entire 240 foot cable in a zigzag pattern across the edge of your roof in the gutters and down your downspout.
Long for large roofs.
Product overview the thermwell 200 ft.
It help prevent ice from forming under the edge of your shingles.
Heat cables for ice dams ice dams can pose many problems.
Roof de icing cable kit can be used to keep gutters and downspouts flowing.
When it reaches the eaves where the temperature of the roof is colder the water refreezes.
This de icing kit comes with shingle clips and is 200 ft.
The thermwell 100 ft.
Secure shingle clips to roof shingles using a flathead screwdriver making sure to align them in a zigzag pattern.
They form when snow melts in warmer areas of the roof sending water running down toward the edge.
Long for large roofs.
As mentioned above you will use about 8w per linear foot of ice melting cable.
In this video master electrician for ask this old house scott caron helps a homeowner install heat cables on his roof to stop ice dams.
Clip in the cable along the same zigzag pattern as the shingle clips.
That equals to 2 3kwh per hour or almost 56kwh per day of continuous operation.
This de icing kit comes with shingle clips and is 100 ft.