I recently expirienced some ice daming on the roof gutter (rain catch) on the large low pitched side of our house. After removing the ice I ran some left over 'Rope light' in the gutter for heat trace. This is rated for exterior use! At about 4w/ft it is about the same as exterior heat trace cable. I only plug it in when I need it or run it off a timer, is seams to work. Question is when snow covers the rope light am I getting efficient heating or is 1/2 of the energy being wasted in light. Will it help to paint it black to turn more of the light into heat?
If I need to purchase specific roof heat trace, what will this cost, the roof is approx 20 ft long. and