• If you are treating only the gutters for ice problems, use a "double-run" of cable in the gutters and downspouts. Figure 20a shows a gutter installed
with gutter spikes. Route the cable under and over the gutter spike to keep the cable suspended off of the bottom of the gutter. Spacers should
be attached every 12 inches. Figure 20b shows a gutter with external gutter straps. Use the clips and spacers to keep the cable suspended off the
bottom of the gutter. Clips should be attached every 3 feet along the roof.
Figure 20a. Double run of cable in gutter-only applications (gutters
with gutter-spikes)
Routing the cable in downspouts using cable spacers
• "Along run" downspouts. For downspouts that are along the run
of the roofline 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: to avoid overheating the cable and increasing the risk of
fire or electric shock, no part of the downspout may pass through a
building.
You must first determine the total length of cable needed to go down
and back up the downspout. It is important to measure as accurately
as possible because the cable must be flush with the end of the down-
spout. No cable may be extended out the end of the downspout.
Several different methods for determining the length may be used.
One is to tie a small weight (such as a washer) to a string and lower
it into the downspout. Once the string passes through the bottom
of the downspout, mark the string as needed to record the length of
the downspout. You will need twice this length of cable. (Note: For
accurate results, use a string that does not stretch when the small
weight is attached.)
Figure 21. Double cable run in "along run" downspouts
14
Figure 20b. Double run of cable in gutter-only
applications (gutters without gutter spikes)
Alternatively, you could also use a tape measure to measure each
section of the downspout. To calculate the total cable needed, add
the measurements in each section and multiply by 2.
Lastly, if it is not possible to use either one of these above methods,
you may use the cable itself to estimate the length of cable needed
in the downspout. However, to avoid snagging or cutting the cable
on sharp edges, take care when pulling the cable into and removing
it from the downspout. Inspect the cable for damage and do not use
a cable that has been damaged.
Once you know the length of cable needed, the next step is to install
spacers and feed the cable into the downspout. Spacers must be at-
tached to 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 (see Figure
18). Do not hammer to tighten the clips and spacers. Pull the cable
into the downspout using a weighted string.
ADKS Owner's Manual