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Removing the snow from your roof does a couple things...
1. It takes all the weight off the roof.
2. When the snow is on there and it starts to melt there is more of a chance of standing water doing damage to your home, this is in my experience. I see a lot of foreclosed homes that I work on develope significant water damage during this time of year. Snow doesn't get removed, and the water flows less freely, the water finds every place possible to leak through.
3. Safety...like the above poster said...when it all starts to melt it comes flying off and can seriously hurt people. At Mt. View Elementary school they had this problem some years ago. Snow came off the roof and hit a girl, it really hurt her.
I'm sure there may be other reasons too, but those are the 3 I can think of.
Depending on how tall the roof is you can get those extendable roof brushes. I've seen a lot of people use those to get the snow off their house. Its safer than crawling up there yourself.
Hope this helps a little.
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