If you do not evaluation your roof structure regularly you may be subject to bigger hassles than you thought. Your roof structure over time can get weighed down from snow as well as ice spots. From the melting ice plus snow, the roof structure will start to rot in the divots caused by the heaviness. The approach will continue every time it rains or snows and your roof structure will commence to turn to mush not only in that spot but it will commence to expand plus spread to your entire roof structure. Once the rot sets in it will commence to deteriorate plus even compose big holes or cave all the way in.