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ice melt. NaCl, MgSO4, CaCl Answered

http://andthatsthewayitis.net/2011/05/17/salt-does-not-melt-ice/ 

thought about running a chainsaw to remove ice from roof gutters. rethought that.

sodium chloride? corrode metal gutter and hurt plants.

mag sulfate?   have it on hand, but above link indicates it wont work.
would it work if baked to drive off h2o?  stuf comes hydrated.

calcium chloride? directly on metal?

Discussions

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Toga_Dan

4 years ago

research indicates cma, calcium magnesium acetate is less corrosive.

store had none in stock.

bought electrc heat tape, cut away 9 foot icicle with chainsaw and axe, set up heattape to thaw gutter n ice dam. done.

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Kiteman

4 years ago

Are you asking for advice on de-icing your gutters, or critiquing the article?

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gmoon

4 years ago

We had a roof ice dam 15 yrs ago or so. At one point I was chopping away with an ice adze... The shingles/membrane have been replaced since then, and the problem never reoccurred.

At the time I put some thought into the problem. One idea was to use carbon black--dust it around the ice. Even without full sun, it should accelerate the melt a great deal, and wouldn't cause damage (either to the roof, or the environment). Never actually tried it.

(I seem to recall reading something about it's use possibly by Shackleton, or some other antarctic or arctic explorer; using it to melt ice around the ship.)