What Causes Ice Dams And How We Can Prevent Their Occurrence

By Ines Flores


Winter has a lot of effects, both negative and positive. However, the bad effects have over time outweighed the positive ones. The negative effects include among others, the formation of ice dams. The dams are accumulations of ice forming on the roofs, thus preventing the water which is melting from roof from draining. This undraining water has a lot of effects, including leaking into the house, causing harms on the walls, ceiling destruction among others. The city of Wauwatosa, WI has been affected by these and the causes and solutions explained below will help assist the residents.

The dams are caused by some dependent situations. First, there must be certain interactions of atmosphere temperatures, house heat losses and snow covers. There must be snow covering roofs for these dams to form. At the same time however, the upper section of a roof must be having temperatures above 32F, and the lower part having lower temperature.

However, this temperature must have been consistent over a substantial amount of time. The melting water increases the size of ice dam. It is important to note that this will be limited to the part that has lower temperatures. This accumulated water will seek for cracks which are on the outside of roof, and then flow to attic space. From there, the water will move into ceiling. This will eventually stain the finish of the ceiling. Snow is the major cause of these pandemics. This is because of the simple fact that snow is an insulator.

For an ice dam to form there must be a difference in temperatures. Being mainly found on the edges of roofs, the dams are always associated with some high heats on one point. This source of heat comes from the hose below, either through the chimney or other sources. It is important t note that solar heat alone cannot cause this temperature difference.

Heat is majorly transferred through: convection- this is the transfer of heat through solid substance, radiation- the transfer of heat through electromagnetic waves and convection- heat transfer through air. We can view these transfers when the heat is transferred through the ceiling or when an individual puts an arm on a hot pan.

Another source of heat may be the exhausts systems especially the ones found bathroom. These systems terminate roof above thus causing the heat to leak. Chimneys also contribute to this heat, especially when you continuously use the wood stoves.

We can however prevent these pandemics by taking some precautions. The first thing we can do is to prevent the heat which comes from the house. However, start with removing all the snow which is on the roof. By doing this you are doing away with the causes of the dams. To remove this snow, use something that will not damage roof.

In case of long term prevention, one should make the house ceiling to be air tight. From there, it is advisable to increase the insulation of a roof. Immediately you identify the air leakages, it is recommendable you apply the above precautions. It is also very important to have air ventilation in order to reduce the amount of heat going up to the ceiling.




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