Shrubs windowsills cars pets and people.
Ice dam roof insulation.
The snow layer traps warm beneath the snow which causes it to melt.
New construction should have a continuous 100 effective air barrier through the ceiling.
If the ice dam breaks free it can pull shingles and gutters off with it and it will damage anything it falls on.
The melting of roof snow comes from the combination of three basic causes.
Ice dams and icicles form when the snow melts runs down your roof and refreezes near the edge.
The tutorial how to prevent and remove ice dams describes what ice dams are and how you can try to prevent them from forming and damaging your home.
Another highly undesirable consequence is wet attic insulation which will likely loose its r value and cause serious mold issues.
Ice dams can be a real problem in winter.
From torn off gutters and falling shingles to peeling paint ruined flooring and stained ceilings if the water gets into the house.
Ice dams can form when as little as 1 or 2 inches of snow accumulates on a roof if the roof is poorly insulated and air sealed and the snowfall is followed by several days of sub freezing temperatures.
While some warm spots on the roof occur because of sunlight most are caused by heat escaping from the heated portions of the house.
Since heat transfer through the roof is the main cause of ice dams insulating the attic with foam insulation can help prevent ice dams by reducing the amount of heat transferred through the roof.
Ice dams may result in leaks through the roofing material possibly resulting in damaged ceilings walls roof structure and insulation damage or injury when the ice dam falls off or from attempts to remove ice dams.
Ice dams usually start or worsen after a heavy snow because of snow s insulating properties.
In the tutorial it also describes some of the preventative things you can do before winter including.
Eventually it will drip into the insulation and down into the ceilings and exterior walls beneath the eave ruining sheetrock and paint.
Ice dam prevention is best achieved in three ways.
In fact while it is normal for warmer air to circulate in the attic it should be exhausted through vents located near the ridge.
There should not be any air leakage from the house into the attic space.
New construction practices should follow or exceed the state code requirements for ceiling and roof insulation levels to prevent ice dams.
Air temperatures well below freezing.
Problems with an ice dam roof can vary greatly.
Ice dams develop as snow on the upper part of the roof melts.
