Seeing icicles dangling from your roofline may seem charming, but it may be a sign of a serious problem. When ice and snow on your roof melt and refreeze, they form an ice dam. Ice dams block water from draining from your roof and can cause leaks, mold growth, and structural damage.
Icicles and ridges of snow on your roof and gutters are common signs that you may be dealing with an ice dam. In this article, we’ll discuss everything you need to know about ice dams to help you identify them before they cause problems for your home.
What Does an Ice Dam Look Like?
Ice dams form when water from melting snow refreezes along the edges or valleys of your roof, eaves, overhangs, or gutters. As ice and snow build up in these areas, a blockage or dam forms, preventing water from properly draining from your roof.
The continuous cycle of snow melting and freezing causes water to accumulate behind the blockage and back up, which is why roof valleys are prone to ice dam formation. An ice dam resembles a thick ridge of ice on your roof.
Icicles hanging from the edges of your roof or gutters are telltale signs that you may have an ice dam. However, this does not guarantee that you have an ice dam. You’ll also need to look out for the other signs of ice dam formation:
| Signs | Where to Look |
| Icicles | • Roof overhangs, eaves, soffits, or soffit vents • Gutters |
| Ice buildup | • Along roofline (especially if you have more than 3 inches of ice) • Exterior walls and siding • Roof valleys • Gutters |
| Water leaks or stains | • Interior ceiling |
What Causes Ice Dams?
Varying temperatures across your roof create ice dams. These inconsistent temperatures are typically caused by improper insulation, inadequate ventilation, and unpredictable weather.
The higher portions of your roof tend to be warmer, which melts snow. As this melted snow moves downward to the edges of your roof, it can refreeze because this area is colder.
Why are Ice Dams Bad for Your Home?
Spotting the earliest signs of ice dams helps prevent structural damage to your home and safety hazards to you and your family. When ice dams block the water flow from the melted ice and snow from your roof, your home is at risk of water and structural damage.
Structural Damage
Working gutters ensure water, including melted ice and snow, flows away from your home’s foundation. As ice dams prevent proper water drainage, they can cause structural damage to your home’s foundation or basement.
Dennis Fraser, the owner of Fraser Gutter Cleaning, says: “As the ice eventually melts, poorly directed runoff can pool around the foundation, leading to cracks or basement leaks.”
Gutter Damage
Ice dams cause big chunks of ice to block your gutters. Fraser explains the dangers this extra weight poses to your gutters: “Ice dams add hundreds of pounds of pressure, bending, loosening, or even tearing gutters away from the fascia.”
Roof Damage
Similarly, ice dams add weight and strain your roof and roofing material. Fraser warns, “Melted snow that refreezes at the eaves can push water back under roofing material, leading to leaks inside the home.”
Leaks
Water leaks, one of the most common problems caused by ice dams, lead to other problems in your home’s interior. “Leaks from ice dams can stain ceilings, damage insulation, and promote mold growth,” Fraser explains.
FAQs
There are several ways you can remove an ice dam, including applying calcium chloride ice melt, pouring hot water over the ice dam, and fixing your home’s ventilation system.
Yes, you can prevent ice dams. Some options you can consider include improving your attic’s ventilation, installing heated gutters, and cleaning your gutters before winter.
It depends on your homeowners’ insurance policy if your insurance provider covers damage caused by ice dams. Check your policy to know what areas of your home are protected by your coverage in case you need to file a claim. Note that if the damage is the result of improper maintenance, it probably won’t be covered.
| Meet the Expert: Dennis Fraser owns and operates Fraser Gutter Cleaning with his wife. In addition to providing professional gutter cleaning services, Fraser is dedicated to helping elderly homeowners keep well-maintained gutters. |
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Main Image: Ice dams hanging from house roof gutters. Image Credit: Glynnis Jones / Adobe Stock
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