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09/2010 VIFSU154 08090418 - 01
Frost protection of roofs
During periods with cold and precipitation
dangerous and damaging ice formations are
often formed on the roof, in roof gutters and
down pipes, especially when the temperature
is around freezing point.
Later, when the weather changes the melt
water cannot be carried off which often causes
damages on buildings. These problems can
be prevented with Devi Iceguard heating
cables installed on the roof and in gutters
and down pipes.
Concerning roof constructions with low slope
it is often sufficient to install Devi Iceguard
in roof gutter and down pipe to ensure an
efficient draining off of the melt water.
Concerning roof constructions with high
slope it is often necessary also to install the
heating cable on the lowest section of the
roof. If the roof is supplied with snow fence
the cable can be installed from this to the
roof edge with advantage.
Concerning valleys, the cable must be
mounted in the valley. To achieve efficient
protection the C-C distance should not
exceed 15 cm.
For control of roof systems Devi offers dif-
ferent thermostats such as Devireg™ 316,
Devireg™ 330 or Devireg™ 850.
Installation:
In many ordinary roof gutters it is sufficient
to install one cable length in roof gutter and
down pipe.
Typically, the cables should be installed with
a C-C distance of approx. 15 cm. To ensure
the distance spacing clips can be used.
With the above mentioned installation the
system will typically ensure ice and snow
melting down to a temperature of approx.
-10°C.
If you want to frost protect the roof down
to -20°C, a general rule will be to double the
effect, and for -30°C to triple the effect.
If the cable lies across an edge etc. the spacing
clips can be used to relieve strain on the
cables, e.g. where the cable enters the down
pipe.
Relief of a cable hanging in the down pipe is
necessary when the cable length in the pipe
exceeds approx. 25 cm.
The cable in the down pipe should continue
to frost-proof depth under the surface of the
ground (approx. 1 m).
Cables installed on the roof must always be
positioned upwards/downwards and not
along the roof. The installation can be made
with a zigzag pattern as shown on the illus-
tration on the next page.
GB
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