Damage caused to your home from ice dams
During the winter months as a result of the freezing and thawing cycle ice dams can form when snow falls on the roof of your home. As days get warmer the snow on the roof melts and runs down the roof towards the eaves. When the water hits the eaves, it can freeze, creating an ice dam. As water continues to run down the roof it becomes trapped behind the dam and will often flow back up under the shingles, eventually causing water damage to the interior of your home.
Main cause of an ice dam formation
The sun causing the snow to melt
Insufficient attic insulation causing hot air in the attic to rise and thereby melting the snow
Natural accumulation of ice on the roof due to varying weather conditions
Eavesthroughs poorly located and unable to collect falling snow and ice from the roof
Inadequate ventillation, thermal bridging, condensation in the attic?
Poor roof ventilation can nullify the manufacturer’s shingles warranty. During warmer months hot air trapped in the attic can heat asphalt shingles and cause them to crack, warp, and dry out prematurely amongst other things. Hot air and humidity trapped in an attic can cause damage to the roof structure of your building. During the winter, poor ventilation can cause the formation of ice dams, further damaging the roof.