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An ice dam has the potential to cause serious damage to
both your roof and the inside of your home. It is important to take the right
steps to protect your home from the risks associated with heavy snow and ice.
What is an Ice Dam?
An ice dam can form when water from melting snow re-freezes at the edge of your roofline. Without roof snow removal, the ice dam may grow large enough to prevent water from draining off the roof. The water can then back up underneath the roof shingles and make its way inside your home.
Immediate steps you can take to remove Ice Dams:
Clear downspouts. An easy way to help snow and ice drain off your roof is to make sure the area around your downspouts is clear. This will make it possible for your gutters to drain when snow does melt. It will also help prevent flooding when the snow and ice melts.
Remove snow from your roof after every
storm. Use a roof rake to clear the first three to four feet of snow from
your roof immediately after each winter storm to prevent ice dams from
forming. While the amount of snow and ice that your roof can handle may vary
depending on a number of factors such as the roof type, age and condition of
the structure, a good rule of thumb is if there is more than a foot of heavy,
wet snow and ice on your roof, you should try to have it removed.
Longer-term Ice Dam Prevention:
Ultimately, the best prevention for ice dams is to eliminate the conditions that make it possible for them to form in the first place. Insulate your attic. Make sure your attic is well insulated to help prevent the melting-and-freezing cycle that causes ice dams to form. Check and seal places where warm air could leak from your house to the attic, including vent pipes, exhaust fans, chimneys, attic hatches and light fixtures.
Install a water-repellant membrane.
When replacing a roof, make sure to install a water membrane underneath the
shingles. This acts as an extra barrier that helps prevent water from seeping
inside the building.
Removing snow from your roof to Prevent Ice Dams
Clearing the first three to four feet of snow from your roof immediately after each winter storm can help prevent ice dams from forming. If you have a flat roof that is easily reached from an interior stairway, you may want to shovel the roof. When de-icing, remember to put safety first any time you are on a roof, especially one that is covered in snow and ice. If you have any doubt, leave it to the professionals.
If you have a sloped roof, it may be
possible to remove the snow and ice using a roof rake, a long-handled tool
designed specifically for this purpose. Stand on the ground and pull as much
of the snow off the eaves as you can safely reach. It is not necessary to
remove all the snow; removing the first three to four feet of snow closest to
the gutters will help alleviate these issues.
If you cannot reach the roof, many
homebuilders, landscaping and roofing contractors, and property maintenance
companies will remove snow and ice from roofs. Before hiring a contractor, Metropolitan
Engineering recommends that you check references. Always get a minimum of 3 references and
always obtain cost estimates from at least 3 contractors. Always be sure your contractor is insured
and bonded.
We do not recommend using a ladder in snowy and icy conditions. This can be extremely dangerous and is best left to professionals. 
Removing ice dams
Just because an ice dam is present does not necessarily
mean water has penetrated the roof membrane. However, it is always best to
remove ice dams before they have the opportunity to cause damage. To
determine if you have damage, look for water stains or moisture in the attic
or around the tops of exterior walls on the top floor.
If you can reach the roof safely, try to knock the ice dam off with a roof rake, or cut a channel through the ice to allow standing water to drain.
If you cannot reach the roof safely,
consider hiring a contractor to remove it.
Another method is to fill a nylon
stocking with calcium chloride ice melt and place it vertically across the
ice dam so that it melts a channel through the dam. If you try this method,
make sure you can safely position the ice melt on your roof, and make sure to
use calcium chloride, not rock salt. Rock salt will damage your roof. Also be
aware that shrubbery and plantings near the gutter or downspout may be
damaged.
Look carefully at large icicles. If the
icicles are confined to the gutters and there is no water trapped behind
them, this does not indicate the presence of an ice dam. However, large
icicles can pose a danger to people when they fall off. Try to safely knock
the icicles off from the ground, making sure not to stand directly beneath
them. If you cannot reach them safely from the ground, consider hiring a
contractor to help.
Generally speaking, property owners are responsible for the cost of preventive maintenance. However, each claim is unique, and coverage and claim decisions always require an expert analysis by a licensed Claim professional. Keep in mind that the cost of snow removal is likely to be considerably less than the cost of roof damage or interior property damage caused by water leaks. |