icicles from gutters / heat cable

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  #1  
Old 10-13-15, 10:44 AM
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icicles from gutters / heat cable

We used to get icicles forming from the gutters, which was causing meltwater to form on the balcony below and for it to be slippery underneath a layer of snow.
This also causes a problem in spring when it melts.
We installed gutter cables last year, which seems to have completely solved the problem but I'm wondering how long they should stay on for every day.
The other problem is that one of the fireplace flues tends to melt a section around the flue, which then forms a dam right at the edge of the roof/gutter. Again, the cables helped this melt a bit but it seems like they need to be on at least 12 hours a day (when temps are below 40)
We have snow barriers on the roof so now will normally stay on the roof most of the winter - it is not feasible to clean it off after every storm.
 
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Old 10-13-15, 11:57 PM
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You basically have two choices.....
1- Run them as long as necessary to do the job.
2- Stop the hot air that is escaping and melting the snow.

The heat escaping from your house is rising up to the attic and heating the roof deck and melting the snow.
 
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Old 10-14-15, 07:09 AM
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Isn't that almost impossible to stop?
The roof is insulated but just a thin layer, there is no attic in this house, the roof is lined with wood paneling on the inside and then fiberglass insulation, then the metal roof above.
It gets to -22 in the winter so I think heat escape is always going to happen?
 
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