Ice puck-sized calcium chloride tablets might provide a moment of temporary relief for an entrenched ice dam, but the corrosive chemical can discolor roofing, eat away at flashings and damage landscaping below.

The real solution to ice damming, of course, is a well insulated and ventilated attic. But you still need a quick fix to melt the ice and remove the immediate source of leaking. This blog provides the details.