The snow that typically accompanies cold weather tends to pose a problem for roofs. Naturally, snow melts when it comes into contact with warm roofing in Toronto. However, sub-zero temperatures can easily cause the water to refreeze, and if allowed to happen enough times, ice dams may form.
Ice dams are thick, solid blocks of ice that prevent water from reaching a home’s gutters. With nowhere else to go, the water is redirected towards siding and any other spaces it can find, resulting in water damage to the interior of a home. Ice dams may also form due to warped, loose, or curling shingles.
http://www.walkercontracting.ca/industry-news/brutal-temperatures-and-snow-persistent-threats-to-toronto-roofing/
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