I've had water coming through the ceiling of my bedroom this winter and the last. Seems to happen when we get a lot of snow and then the temperatures go up above freezing all of a sudden and it all starts to melt. Next thing we know we're back below freezing at night, an ice damn forms, the ice goes up under the shingles...and I wake up to water on the wall...or as with last weekend, coming out of the center of my ceiling. It only happens in our bedroom...no where else in the house so far in three winters. I'm trying to stop it and so far have been raking the first half of the roof to get as much snow off as possible. My father and a few others have suggested the electrical heat cable/tape sorta stuff. You run it in a /\/\/\ pattern across the edge of your roof and then plug it in to an outlet somewhere close. It keeps ice from forming and gives water a place to run off to. Anybody had experience with this stuff? I know it's kind of a bandaid but funny thing...contractors/roofers don't seem to want to come out to your house in the winter.