|IBHS Provides Property Protection Guidance for Winter Weather|
|News Releases - General Info|
|Written by Joseph King|
|Monday, 17 October 2011 13:17|
Tampa, Fla. (October 17, 2011) - If the last two years are any indication of what is in store for the upcoming season, this winter will be a serious threat to homes and businesses, according to the Insurance Institute for Business & Home Safety (IBHS).
During both 2010 and 2011, the U.S. received near record amounts of snowfall, including 2011’s Groundhog Day Blizzard, which caused $1.1 billion in insured losses and more than $2 billion in total losses, according to the National Climatic Data Center.
“Winter weather can inflict substantial damage to your home or business,” said Julie Rochman, president & CEO of IBHS. “Preparing now, while cooler weather setting in reminds us that winter is coming, but before freezing temperatures arrive, will help you avoid costly losses.”
An ice dam is an accumulation of ice at the lower edge of a sloped roof, usually at the gutter. When interior heat melts the snow on the roof, the water will run down and refreeze at the roof's edge, where temperatures are much cooler. The ice builds up and blocks water from draining off of the roof, forcing the water under the roof covering and into the attic or down the inside walls of the house. Take the following steps to decrease the likelihood that ice dams will form:
Frozen water in pipes can cause water pressure buildup between the ice blockage and the closed faucet at the end of a pipe, which leads to pipes bursting at their weakest point. Pipes in attics, crawl spaces and outside walls are particularly vulnerable to freezing in extremely cold weather. Frozen pipes can also occur when pipes are near openings in the outside wall of a building, including where television, cable or telephone lines enter the structure. To keep water in pipes from freezing, take the following steps:
Is Your Roof Strong Enough?
Building age is a major factor in how much snow a roof can handle. Newer building codes provide much better guidance for estimating snow loads, particularly the increased loads near changes in roof elevations where snow drifts and snow falling from an upper roof can build up on the lower roof near the step. For flat roofs, the step-down area between roof sections is particularly susceptible to snow overload because of the tendency for ice and snow collection, especially during periods of windy weather.
Older roofs can suffer from corrosion of members and connections which can reduce its ability to resist high snow loads. Buildings with lightweight roofs, such as metal buildings or built- up roofs on bar joists generally provide less protection from overload than heavy roofs.
Roof top equipment and roof projections, such as mechanical equipment that is over 2 feet tall, causes snow accumulation due to drift, creating the need for higher snow load consideration in these areas. A serious condition can be created when a taller building or a taller addition is built adjacent to shorter, existing building. Unless the shorter building is strengthened in the area next to the taller building or addition, snow accumulation on the lower roof near the step could produce much higher loads than those considered by the original designer for the existing building.
The best source for determining how much snow load a building can handle is the original design plan. Most roof designs can support at least 20 pounds per square foot. However, design loads can range from 10 pounds to 20 pounds per square foot in Mid-Atlantic states, and between 40 pounds and 70 pounds per square foot in New England.
Guidelines to Estimate Snow Weight
Snow and Ice Removal from Roofs
IBHS recommends that property owners not attempt to climb on their roof to remove snow. A safer alternative is to use a snow rake while standing at ground level.
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