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An ice dam is an ice build-up on the eaves of sloped roofs of heated buildings that results from melting snow under a snow pack reaching the eave and freezing there. Freezing at the eave impedes the drainage of meltwater, which adds to the ice dam and causes backup of the meltwater, which may cause water leakage into the roof and consequent ...
For this edition of the Scrub Hub, we are looking at ice dams: What are they, what causes them, and what problems are they making worse?
To avoid the formation of ice dams, taking preventative measures is key. This includes regularly cleaning out your gutters and downspouts to ensure that melting snow can properly drain away.
Ice dams occur when heat escapes through the uppermost part of the roof, and the snow at those points melts, refreezing as it drips along the shingles, and collecting in the form of ice at the lower points. This can result in structural damage from stress, including the destruction of gutter and drainage systems.
When the meltwater reaches the freezing air, ice accumulates, forming a dam, and snow that melts later cannot drain properly through the dam. [87] Ice dams may result in damaged building materials or in damage or injury when the ice dam falls off or from attempts to remove ice dams. The melting results from heat passing through the roof under ...
Many shingle installations benefit from being placed on top of an underlayment material such as asphalt felt paper to prevent leaks even from wind driven rain and snow and ice dams in cold climates. At the ridge the shingles on one side of the roof simply extend past the ridge or there is a ridge cap consisting of boards, copper, or lead sheeting.
The glacial flooding, however, is a reminder of the global risk from bursting snow-and-ice dams — a phenomenon called a jökuhlaup, which is little known in the U.S. but could threaten about 15 ...
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