We recently bought a home in western NY, where lake-effect snows are common. I've got 1-2.5 feet of snow on my roof right now and the prediction is for much warmer temps (it's been in the single digits for several days and is heading up to nearly 40F in a couple days!).
We've had some sun/warm over the last few days and my roof shows no sign of major--or even minor--ice build-up (though gutters are full/frozen). The attic is well insulated & ventilated and there's no sign of previous ice-damming inside or out.
I grew up in the Finger Lakes area south of Canandaigua and we never touched the snow on the roof. I raked snow from my former Idaho home, but it was mostly because of a slope break in the roof and concern for weight. This home was very well built (Chautauqua County NY) about 7 years ago.
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