Under mild snowfall conditions like the seasonal Virginian winter, the zigzag arrangement works very well. Heating cables normally require a spacing of 24 inches from trough to trough. The longer the eave, the higher the multiplier effect that can be used to estimate the footage required. A 6-inch eave 100 feet in overall length, for example, has a multiplier effect of 2.2 and needs 220 feet of cable. Ventilation is a common issue when it comes to ice dams and other winter roof problems. For starters, the attic isn't getting enough heat (or losing a lot of it) to melt the snow. Heating cables are somewhat of a stop-gap measure until Hanover, VA roofers can fix or redesign the roofing system to mitigate heat loss.
http://www.deshazoroofing.com/thinking-heating-cables-leave-installation-richmond-va-roofers/
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