That ridge of ice that's hanging precariously off your roof is called an ice dam. While it may look pretty to see all the icicles hanging down, an ice dam will keep snow from sliding off your roof and can back up water, causing damage to your shingles. A normal asphalt shingle roof should last 15 to 30 years, according to Bob Vila, but the damage resulting from ice dams may shorten that lifespan. A roofing contractor service can help salvage your roof after ice dams form, but there are strategies you can employ to prevent the problem before it happens. Here's what you should know about ice dams.

Causes of Ice Dams

Ice dams result from a non-uniform surface temperature on your roof. This is a combination of multiple factors, including home heat loss, your roof's temperature, and snow cover. In other words, higher portions of your roof are above freezing, while lower parts are below freezing. This causes the snow to melt and run downwards, only to freeze and back up around the roof's edge and gutter line.

How to Prevent Ice Dams

There are a few ways that you can control heat loss in your home and prevent ice dam formations. One strategy is to use roof rakes to remove snow on your roof before it has a chance to melt and refreeze. This removes the item that is necessary for ice dams to occur.

Another good prevention method is to keep the ceiling from allowing moist air into the attic. This means finding air leaks and sealing them with roof or attic insulation. In addition to helping prevent ice dams, eliminating drafts can also save you money on your energy bills.

You should also consider increasing natural roof ventilation, but avoid mechanical ventilation. Natural ventilation can help create a uniform temperature on your roof, while mechanical ventilation may cause moisture issues in the attic and create negative pressure. Natural ventilation can also lower summer heat buildup, so it will benefit you all year long. A roofing contractor service can tell you more about the differences between natural and mechanical roof ventilation and why natural ventilation is a good investment.

If you need a roofing contractor service to assist you with ice dams or other roofing solutions, call Cook's Roofing today! We've been in the business for more than 35 years and will be happy to help you with all of your roofing needs.