Ice dam


Also found in: Wikipedia.

Ice dam

A ridge of ice that forms along the lower edge of a roof, possibly leading to roof leaks, caused by heat leaking from the attic, which melts snow on the upper parts of the roof. The water then refreezes along the colder eaves and works its way back up the roof and under shingles, thus causing leakage.

ice dam

ice dam
A buildup of snow and ice at the eaves of a sloping roof.
References in periodicals archive ?
It's a nightmare," said Georgia Hagan, of Gutter Medics in Naperville, a company that's been swamped with business this week as people seek ice dam removal.
a weather network and analytics company, recently announced a strategic partnership will now allow Betterview users to review historical hail, high wind, precipitation and ice dam data before sending a drone out to inspect buildings & properties.
Not only did Schoolcraft stay on top of all service requests and vendor meetings, he also tackled snow removal and ice dam repairs totaling more than $100,000.
If temperatures cool rapidly, the melted water that has migrated to the drainage areas freezes, forming a dam that holds back water and creating a ponding water area behind the ice dam, Herring explains.
She lived in a mansion and had an ice dam on the roof.
We know from experience that misguided attempts to remedy problems at the last moment, such as trying to thaw a frozen pipe with a torch or chipping away at an ice dam with a hammer, can lead to disaster.
The Ice Dam Liquidators team is helping Boston property owners recover from these storms by offering professional ice dam removal and snow removal services.
double dagger]) Constructing a vented "over-roof" over the top of an unvented "under-roof" is common in high snow load areas to control ice-damming (see "Dam Ice Dam," ASHRAE Journal, June 2010).
The classic view of the Younger Dryas cooling interlude has been that an ice dam in the North American ice sheet ruptured, releasing a massive quantity of freshwater into the Atlantic Ocean.
A jokulhaup is the Icelandic term used to describe a glacial outburst flood resulting from the failure of a glacier ice dam or from the melting of glacier ice by a volcanic eruption.
It was caused by the ice dam clogging the Neva, resulting in flooding of nearby cities.
Events leading up to the sharp climate-cooling period known as the Younger Dryas, or more familiarly as the "Big Freeze," unfolded after glacial Lake Agassiz, at the southern edge of the Laurentide ice sheet covering Hudson Bay and much of the Canadian Arctic, catastrophically broke through an ice dam and rapidly dumped thousands of cubic kilometers of fresh water into the ocean.