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I forgot to add...
Some pics show the sock made from nylon stocking legs , etc as being long like a french bread (I think someone mentioned this. These long socks the lay over the ice dam at 90 degrees. The idea is to melt a channel about 2 inches wide straight through the dam to let the water above it drain out. Some show these socks maybe every 4 feet apart.
The biggest spot i am worried about is where a 1 in 12 roof intersects a standard 3 in 12 slope roof. The flatter one has a membraine the steeper has regular shingles. The corner where they meet has a big chunk of ice growing along the both 90 degree directions. Its very high and very thick but especially where the two slabs meet in the corner.. Its also in a spot that is a real pain to get to , even with a ladder. That's the spot I may take the chance and go with the salt socks , etc.
Og BTW , one article was really particular to use the Cal Cl not Rock salt . I don't know why for sure but I think its damage caused by salt assisted corrosion or something like that. Anyway , they say do not use standard rock salt.
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