Routing inside of downspouts
“Along run” downspouts
For downspouts that are along the run of the roof line being treated, the cable must be routed down and back up the inside of the downspout. Do NOT wrap the cable around the downspout or otherwise attempt to attach it to the outside.
Remember that in order to avoid overheating the cable and increasing the risk of fire or electric shock, no part of the downspout may pass through a building.
Once you know the length of the cable needed, the next step is to install clips and feed the cable into the downspout. Use the clips as a spacer on the cable every 6 inches so that the cable does not touch itself in the downspout.
You must tighten the spacers before the cable is installed in the downspout. You may do this with your fingers or pliers. If you use pliers, squeeze gently and use care to avoid pinching, crimping, cutting into or otherwise damaging the cable.
Do NOT hammer to tighten the clips. Pull the cable into the downspout using a weight string.
“End of run” downspouts
If a downspout exists at the end of the run of the roof line being treated, the cable must be routed down the inside of the downspout. There is no need to route it back up.
Do NOT wrap the cable around the downspout or attempt to attach it to the outside. Pull cable into downspouts using weighted string. Be sure the run of the cable is flush with the end of the downspout and that no cable is extended out at the end of the downspout.