As the primary defence against precipitation, the roof prevents snow from entering the home; however, heavy snowfall often drops more snow than roofs can handle, causing large amounts of snow to accumulate on roofing. According to experienced Toronto roofers, an over-accumulation of snow on your roof is something homeowners should be wary of. Poorly ventilated homes allow heat to escape through the roof, melting snow that has accumulated and presenting various problems for roofing systems.
Roofs with cracked shingles can easily collect any water from melted snow. The water trapped within the cracks turn to ice when temperatures drop below freezing point and expands, causing the crack to grow larger. Eventually, a small crack can turn into a large hole.
http://www.walkercontracting.ca/industry-news/roofers-in-toronto-warn-homeowners-of-roofing-damage-due-to-heavy-snow/
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