When the heat from the attic combines with the sun’s warmth, the snow, and ice on your roof melt that will eventually form ice dams. The meltwater that flows to the edge of the roof will begin to refreeze. As this process continues, the layer of the ice hanging will get thicker. This will eventually cause a “dam” that will grow as it is fed by the melting snow above it.
The ice dams hanging on your eaves will prevent water from draining off your roof, causing it gets backed up behind underneath the shingles and into your home. It can cause costly damage to your whole roof system, your attic, and even inside the walls of your home.