Installation and Operation Instructions
19
Figure 9. Cable installation through the gutter or drainage pipe in two threads
Alternate
Single
End of run
Along run
If ice formation only occurs in the gutters, the cable should be laid only in the
gutter and drainage pipes in two threads.
If individual sections of the roof are processed, then it may be more practical
to use several separate heating cables. When planning the location of the cable,
think about how each cable will be laid.
In addition, you can use one cable for several areas of the roof.
The cable can be routed from one area to another, either in the gutter or hori-
zontally attached to the tile.
In case of shortage or excess cable length you can:
1) Use the excess cable length to make triangles higher (up to 20-feet in
height) or increase the length of cable loops in the valleys.
2) With a shorter cable, the triangle height can be reduced in areas less sensi-
tive to ice formation.
3) With a shorter cable, if there is a drainage pipe at the end of the treated
roofing line, you can lay the cable down the pipe only once and not, as
recommended, down and back up. In any case, the cable should terminate at
the bottom of the drainpipe.
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