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The idea is to make the breach. I don't know about doing it if there is already dripping inside the house or even behind the gutter into the soffet.
What I have seen is putting the Cal chloride in the sick and then laying the sock just behind the ice dam after you have raked about 2 to 3 of snow off above the gutter. That way the salty water as it melts just touches the very ends of the shingles , etc and then into the gutter. Of course accurately placing that sock just behind the dam does require you to get up there on a ladder. I did see one article with a guy who ties a short rope loop around the sock end and then heeoks the sock on a pole with like a boat hook end and he lays the sock down using the long pole instead of climbing the ladder.
Any way you slice it , ice dams are a B1tch. I have seen a problem with them maybe 5 times in the 45 years in my house.
The best way is to do the raking of the snow off the first few feet before the dam forms. If you get a storm that has the wet sticky snow that fills the gutter and has afoot of snow above it , you use a rake or blade on a long pole to rake the snow off as immediately after the storm as you can.
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