Instruction Manual

10
Skylight
(Special roof
areas)
When installing the heating cable around special roof area such us
skylight, use a “zigzag pattern”. Maintain the triangle base at 38cm
(15in). However, the height of the triangles needs to be greater than
those along the roofline. Increase the triangle height till it extends
to about 15cm/6in into the roof section above the heated portion of
the house.
Caution: Triangle heights must not exceed 6m (20ft). For special
areas that are more than 6m/20ft from the roof edge, a professional
installer should install a commercial-grade de-icing cable.
Cable Length required for Skylight (Special roof areas):
Distance
from the roof edge to bottom of special roof area × Width of ice
dams that form along special roof area × Special Roof Area
Multiplier
Special Roof Area Multiplier
For a Roof Without Gutter For a Roof With
Gutter
1.6
2.6
For triangles that are larger than 91cm/3ft in height, also attach clips every
91cm/3ft up the height of the roof.
Cable Length required for roofline area
+Cable Length required for valleys
+Cable Length required for dormer
+Cable Length required for gutter
+Cable Length required for downspouts
+ Cable Length required for Skylight (Special roof areas)
------------------------------------------------------------------------------------------
=Total cable Length required