HUGE Icicle problem & Heat Loss
The truth is that there are just going to be winters, like this one, that product ice dams more severely than others. We have installed many ice melting systems in gutters and on/under roofs that were designed to be 'cold roofs' yet still have ice damming. The heat from your home will escape no matter how much you insulate it. It will radiate through the walls, windows, ceilngs and roofs. No matter how much you insulate, it will, eventually, make it's way out and will melt the snow on your roof (along with the sun), the water will run down to a point where it is no longer warmed from escaping heat and refreeze. That is usually at the drip edge or in valley's. Then it just depends on the winter and how many times this is allowed to occur whether-or-not it's going to be able to build up far enough to get under the ice/water shield (if you have any at all) and cause damage.
You can throw 12 more inches of insulation on top of the 12 you and have.. heat will still seek the cold.
P.S. I am in no way saying not to insulate. By all means, insulate your heart out. I did. It helps to keep the heat in as long as possible to make the most use of it. But it will have little effect on the melting snow during winters like this one.
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Last edited by warmsmeallup; 02-01-2009 at 01:11 PM.