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Heating Cable Installation
Raychem-IM-H58067-IceStopRoofGutterDeIcingCOM-EN 18/01
Downspouts
Ice may form in downspouts and prevent melt water
from escaping from the roof. To maintain a continu-
ous path for melt water to run off, run the heating
cable inside the downspout to the end as shown in
Figure 14 and Figure 15 below. Follow the appropri-
ate attachment recommendations in “Attachment
Methods‚” page 29. Additional heating cable may
be needed for the roof surface, gutters, and valleys.
Figure 14: Heating cable at top of downspout
Drain removes melt water
below the frost line.
Accumulated ice
may block drains.
Accumulated ice
can be removed.
12"
Figure 15: Heating cable at bottom of downspout
• If the downspout ends underground, the heating
cable should extend into a heated area or below
the frost line.
• For low-water-flow situations, teeing the heating
cable so that a single run goes down the down-
spout is usually sufficient. For high-water-flow
situations, where ambient temperatures often fall
below –10°F (–23°C), or where it isn’t convenient