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mardi 3 février 2015

Resultants Of Ice Dams And Ways Of Preventing Them

By Ines Flores


There are a lot of effects that come with winter, both favorable and unfavorable. The unfavorable however are more than the favorable. Among others, the unfavorable include the formation of ice dams which comes after tremendous snow. These dams are formations and accumulations of snow on the roofs, which prevents the water melting from a roof from draining. The undrained water has effects which include house leakages that cause damages on the roof, the destruction of the walls among others. With the reference of the city of Wauwatosa, WI, we will study the causes of the dams and how they can be prevented.

Some continuous events cause these dams. There must be some interactions of atmospheric temperature, house heat loss and snow covers. For the ice dam to form there must exist snow covering the roof, while consequently, the upper roof surface having higher temperature. The lower part should however have a temperature of below 32 degrees Fahrenheit

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.

There are three ways in which heat is transferred to roof surface namely: convection- which is the heat transfer through solid, convection-transfer of heat via air and radiation- heat transfer via electromagnetic waves. These transfers can be evidently seen when heat is transmitted through ceiling or even when you literary put your hand over a hot pan.

The next source of heat is the exhausts systems especially the ones in bathrooms and kitchen. These systems have the capacity to terminate any roof which is just above them and therefore causing a leak in heat. Chimneys also have a contribution to this heat, especially after a continuous use of wood stoves.

The dams can be prevented by taking some precautions. The first precaution is to prevent the heat coming from the house. Before this however, it is wiser to start by removing all the snow resting on roof. This is because the problem actually starts from a roof. For the emergency situations, make some channels that will be able to drain the water way from the roof.

One can also conduct the long term prevention. This involves making the ceiling of the house to be air tight. Increasing the insulation of roof also helps for long term purposes. This is highly recommended especially when you identify some air leakages. The ventilation in the room are also very important to reduce the amount of heat going up to the ceiling.




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