I'm planning to install deicing cables along the roof eave, valley, 4gutters, and downspout over my garage to eliminate ice damming and allow the melted water to flow down to the ground. I've looked at several brands offering self-regulating commercial quality cable and they all recommend 18" high zig-zagging along the eave and double cables in the gutter. The cable is expensive and I'm wondering if a shorter zig-zag pattern and a single gutter cable would be sufficient. We're at 4,200 feet on the east slope of the Cascades below Mt Bachelor. Freeze/thaw/freeze cycles are the culprit, particularly in the roof valley where we've had giant icicles reaching almost to the ground. Anyone using deicing cables that can offer suggestions?
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