What Causes Roof Ice Dams and How To Prevent Them

Allstate Exteriors • October 16, 2023

A layer of snow covering your roof and icicles hanging from the eaves might look pretty. However, your roof could be at risk of having an ice dam form. Ice dams can significantly damage your roof, so learning more about them as a Ohio homeowner is essential. Knowing how your roof might develop this winter hazard and what damage it can cause helps you understand why prevention is important. With winter approaching, this is a good time to become familiar with ice dams and make sure your roof has the protection it needs.

What Causes a Roof Ice Dam?

An ice dam blocks melted snow from getting to your gutters. If the temperature gets low enough overnight, melted snow freezes at your roof’s eaves. When this keeps happening, an ice dam can form. What causes a roof ice dam? When you have snow on your roof, it eventually melts. The runoff from snow flows down your roof, into your gutters, and to the downspouts. This helps keep all that water from pooling around your home’s foundation, which can cause moisture damage.

Problems with Ice Dams

Once you have a roof ice dam, runoff from melted snow can’t reach your gutter system. Instead, this water can back up under roof shingles and get into your attic. These roof leaks can cause several problems for your home. You can end up with damaged roofing shingles that need to be replaced. Shingle damage or loosened shingles that come off can allow even more water into your attic, especially when you still have an ice dam. As water leaks into your roof and attic, the risk of a mold problem increases.

Moisture damage from ice dams can also cause other problems. Your roofing system, including the decking, can develop wood rot. This causes the wood to deteriorate, which can result in structural issues. Ice dams can damage your gutters. These blockages can cause your gutters to tear away from your home, which prevents them from directing melted snow to downspouts. Without a functioning gutter system, water can accumulate around your foundation.

Ways to Prevent Ice Dams

You don’t have to wait and see if you end up with a roof ice dam this winter. Taking steps to prevent ice dams from developing can give you some peace of mind. Doing the following can help reduce the risk of ice dams and the damage they cause.

Find a Dependable Local Roofer

When you need a reliable roofer for ice dam prevention or roof repairs in Central Ohio, you can count on Allstate Exteriors and Restoration. Our team can install a shield along your roof eaves to prevent ice dams. We can also add insulation or ventilation as needed. Our roofing experts understand how damaging ice dams can be, so we’re committed to helping homeowners lower this risk.


If your roof is damaged from ice dams, we provide timely repairs. Whether you need roof repairs or protection from ice dams, contact Allstate Exteriors and Restoration today. We are the go-to-professional roofing contractor in Central Ohio and will help to protect your home from winter hazards.

Clean Your Gutters

Keeping your gutters clean helps ensure that melted snow has a path to the downspouts. This helps keep water from building up in your gutters and freezing. Clear out any branches and other debris that are in your gutters.

Check Your Gutters and Downspouts

Make sure your gutter system doesn’t have any ice buildup. Check it regularly throughout winter. Keeping the gutters and downspouts clear of ice allows melted snow to flow off your roof.

Clear Off Snow

Having snow pile up on your roof can raise the risk of ice dams and structural problems if it weighs too much. Don’t go up on your roof to shovel snow, though, since this is dangerous. You can use a long-handled roof rake to push snow off your roof while you stand on the ground.

Check Your Attic Insulation

Having enough insulation in your attic means heat can’t escape through your roof. When heat from the inside goes through your roof, it can cause snow to melt unevenly. Snow can melt quickly in some areas and more slowly in others. This increases the risk of having ice dams.

Check Attic Ventilation

Adequate ventilation helps keep the air in your attic colder. This helps reduce the risk of thawing and freezing cycles, leading to ice dam formation. Professional roofers can improve your attic ventilation as needed.

Install an Ice Dam Shield

Having shields installed along the eaves of your roof can help stop ice dams from developing. These shields help ensure that melted snow can flow from your roof instead of backing up under the shingles.

Westerville Homeowners: Keeping Your Roof in Top Shape

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Your home is more than just a place to stash your stuff; it’s the place you’ve poured your life into. Living here in Westerville, we’re lucky to have such a great mix of tight-knit neighborhoods and quick access to everything we need. Whether you’re grabbing coffee near Uptown or taking the kids to spend an afternoon at Inniswood, you know this area is special. But let’s be honest: Ohio weather isn't always kind to our houses. Between the brutal freeze-thaw cycles in the winter and that sticky humidity we get living near the reservoir, your roof takes a beating. It’s the first line of defense for everything inside your walls.  If you’ve been spotting a few stray shingles in the yard or just have a nagging feeling that your roof is getting a bit long in the tooth, you’re in the right place. As a local roofing company, we’ve been up on enough Westerville rooftops to know exactly what makes them tick, and what tends to go wrong. Why "Local" Actually Matters There’s a big difference between a national franchise and a crew that actually lives and works here. We aren’t just reading a manual; we’ve dealt with the same storms you have. The Ohio Reality Check We don’t have mild winters here. We have "ice dam" winters. When your attic isn't venting heat properly, the snow on your roof melts, runs down to the eaves, and freezes again. That cycle can force water right under your shingles and into your insulation. If you’ve ever seen water spots on your ceiling after a winter thaw, that’s usually the culprit. On the flip side, our summers can be relentless. All that heat and humidity can lead to moss or algae growth, especially on the north side of the house where the sun doesn't hit as much. If you let that stuff sit, it eventually eats away at the grit on your shingles. Matching the Neighborhood We’ve worked on everything from the historic homes with unique angles to the newer builds in the suburbs. Every home needs a slightly different strategy. A quick patch might be fine for one house, but a total re-roofing might be the smarter, cheaper play for another. We’re not here to upsell you; we’re here to tell you what your specific roof needs to last another 20 years.

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Historic Roof Care: Preserving Ashville’s Older Homes

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Ashville, Ohio is a community rich with history, character, and homes that tell the story of generations. For many homeowners throughout Ashville and neighboring communities such as South Bloomfield, Tarlton, and Canal Winchester, preserving the charm and structural integrity of these older homes is a priority. When it comes to protecting these architectural treasures, Historic Roof Care: Preserving Ashville’s Older Homes is not just a service, it is a vital investment in maintaining the legacy and value of your property. At Allstate Exteriors , we specialize in delivering expert historic roof care tailored to the unique needs of Ashville’s older homes and historic districts. In the heart of Ohio, older homes were often built with materials and methods that differ significantly from modern constructions. These roofs carry years of history and have faced decades of weather, from icy winters to humid summers. Understanding how to preserve these roofs requires more than a standard roofing service. It demands a specialized approach rooted in respect for historical craftsmanship and knowledge of local conditions in Ashville . In this post, we’ll explore practical guidance, local insights, and the reasons why trusted historic roof care from Allstate Exteriors makes all the difference for homeowners committed to preserving Ashville’s architectural heritage. Why Historic Roof Care Matters in Ashville Many homeowners in Ashville are drawn to older homes because of their distinct charm, unique character, and timeless appeal. However, historic roofs often present challenges that modern roofing systems do not. Traditional materials such as slate, cedar shake, or metal roofing installed decades ago have specific maintenance requirements. The purpose of historic roof care in Ashville is to extend the life of these roofs while maintaining their original appearance and structural integrity. Historic roofs were built in an era before modern synthetic underlayments, advanced flashing systems, and today’s wind-resistant technologies. Over time, exposure to Ashville’s seasonal climate variations can cause traditional shingles to crack, valleys to weaken, and flashing to corrode. Homeowners who postpone preservation work risk accelerated deterioration, water infiltration, and costly repairs in the future. By investing in historic roof preservation , you are protecting the original craftsmanship that makes your home unique while also enhancing long-term durability and performance. At Allstate Exteriors , we take a customized approach to historic roof care that accounts for both the architectural significance of your home and the environmental factors specific to Ashville and the surrounding areas. With decades of combined experience working with historic properties, our team is well-equipped to assess, protect, and preserve roofs that others might overlook. Whether it is a slate roof dating back nearly a century or a cedar shake roof in need of rehabilitation, we provide solutions that honor Ashville’s past while preparing your roof for the future. Understanding the Unique Challenges of Historic Roofs in Ashville Historic roofs are more than just a collection of shingles or tiles, they are an integral part of a home’s architectural identity. Because of this, the process of historic roof care in Ashville begins with understanding the distinct issues these roofs face over time. Material-Specific Challenges Slate, for example, is a beautiful, long-lasting material that can endure for over a century, but individual slates can become brittle and break. Cedar shake roofs offer natural beauty and insulation qualities, but they are susceptible to rot and insect damage if not properly maintained. Metal roofs, often found on historic barns and outbuildings in Ashville, can suffer from corrosion if protective coatings deteriorate. Architectural Complexity Many historic homes in Ashville feature steep slopes, intricate gables, and architectural bezels that create aesthetic appeal but also complicate maintenance and repairs. Without careful inspection and a preservation strategy, water can find its way into vulnerable areas such as valleys, flashing seams, and chimneys. Climate Impact Local weather patterns also play a role. Ashville’s humid summers can cause wood materials to expand, while Ohio’s cold winters bring freeze-thaw cycles that stress roofing components. Heavy rains, spring storms, and strong winds can loosen historically significant roofing elements. Allstate Exteriors’ historic roof care services include proactive measures that anticipate these challenges and address them with precision and care.