Ice Dam Prevention This Winter

If this winter feels unpredictable, you’re not wrong. We’ve been experiencing a familiar but frustrating pattern: cold temperatures and snow followed by milder daytime weather, then freezing again overnight. That constant freeze-thaw cycle is the perfect recipe for ice dams, even in years when snowfall totals are relatively modest.

Ice dams form when snow accumulates on a roof and begins to melt during warmer daytime temperatures. Heat escaping from the home, often through an under-insulated attic, warms sections of the roof just enough to melt the snow. The water then runs down toward the eaves and gutters, where roof temperatures are colder. As nighttime temperatures drop, that water refreezes. When this melting and refreezing happens repeatedly, a thick ridge of ice builds up along the roof edge, creating an ice dam.

These icy barriers don’t just sit harmlessly at the edge of your roof. They block proper drainage, forcing melting snow to back up under shingles. That water can seep into the attic, soak insulation, stain ceilings, damage walls, and create conditions that encourage mold growth. The weight of the ice itself can also pull gutters away from the house or loosen shingles, opening the door to even more water damage.

Homeowners should watch for early warning signs. Large icicles hanging from gutters, uneven snow melt across the roof, or water stains appearing on interior walls during winter are all indicators that heat is escaping and ice dams may be forming.

When ice dams appear, many homeowners are tempted to take matters into their own hands, but this is where things often go wrong. One of the most common mistakes is hacking away at ice with a shovel, axe, or ice chopper. While it may feel productive in the moment, this can easily damage shingles, puncture the roof, or dent gutters, leading to repairs that cost far more than the ice dam ever would have. Another risky approach is climbing onto an icy roof without proper safety equipment. Slips and falls are a serious hazard during winter and can result in severe injury.

Chemical deicers can also cause problems if used improperly. Products not designed specifically for roofs may damage shingles, kill nearby landscaping, or corrode metal gutters. Even roof-safe deicing products should be used cautiously and viewed as a temporary measure, not a long-term solution.

The real fix for ice dams isn’t on the roof at all. It starts in the attic. Proper insulation and ventilation help keep roof temperatures consistent, preventing snow from melting unevenly in the first place. Unfortunately, more than 75% of New England homes are under-insulated, often because they were built before modern energy standards were in place. As a result, heat escapes easily, setting the stage for ice dam formation.

Improving insulation helps keep warm air inside the living space where it belongs, while proper ventilation allows cold air to circulate in the attic and keeps the roof surface cold. Together, these upgrades not only reduce the risk of ice dams but also improve comfort year-round and lower energy bills. They can also help reduce moisture buildup in the attic, decreasing the likelihood of mold and mildew.

With today’s increasingly unpredictable winter weather, ice dams are no longer just a problem after major snowstorms. Repeated freeze-thaw cycles mean they can form quickly and unexpectedly. Addressing insulation and ventilation now, before damage occurs, is one of the smartest investments a homeowner can make.

Bob O’Donnell is the owner of O’Donnell Bros, Inc., a Bristol-based home improvement company established in 1975. Email your questions for Bob to info@odonnellbros.com with the subject line “Ask the Pro.” All questions may be considered for publication. To contact Bob for your remodeling needs, call O’Donnell Bros, Inc. at (860) 589-5155 or visit www.odonnellbros.com. Advice is for guidance only.

What to Know About Ice Dams

This winter has been fairly mild but the season is still in full swing and it won’t be long until we get another storm to remind us that we live in New England. Before that happens, I always like to talk about the dangers of ice dams and the reason why so many homes in our area get damaged by them. 

An ice dam is a solid mass that forms when heavy snow blankets the roof, creating an extra layer of unwanted insulation. As warm air rises from your house and up through your attic, it causes the snow to melt and the water to slide down into the gutters. This would typically be just fine, but because so many homes in our area aren’t properly insulated, the melting ice will often make contact with the cold eaves of the roof and freeze again instead of draining off through the gutters. This forms a large ice mass at the gutter line, which will grow if not taken care of.

Solid ice is heavy and can easily pull gutters loose. The dam can even get strong enough to lift up your roof shingles, creating gaps that let the water through and into the attic. This is when people start to see leaks in their ceilings and walls. 

The only way to prevent ice dams from forming is to have your home properly insulated and ventilated. More than 75% of homes in our area are under-insulated which causes the heat from your home to shoot right through the roof. Because insulation and ventilation weren’t regulated when most of the homes were built in this area, a lot of us have houses that are better suited for Florida winters than our cold Connecticut climate. 

Having appropriate insulation and ventilation will not only keep your home free from ice dams but will also keep you much more comfortable in both the winter and the summer. You’ll feel the difference immediately, and you’ll see the benefit in your energy bills too. A house that can breathe and can properly regulate its own temperature will also be less like to accumulate mold and mildew which is not only damaging to your house but also to your health. It’s a simple solution to keep your family, your home, and your wallet healthy. 

Bob O'Donnell is the owner of O'Donnell Bros, Inc., a Bristol-based home improvement company established in 1975. Email your questions for Bob to info@odonnellbros.com with the subject line “Ask the Pro”. All questions may be considered for publication. To contact Bob for your remodeling needs, call O'Donnell Bros, Inc. at (860) 589-5155 or visit www.odonnellbros.com. Advice is for guidance only.

Watch for Ice Dams

With a week of snow, ice, and temperatures all over the place, it’s a great time to remind homeowners about ice dams. 

Ice dams occur when the heat from the inside of a house melts the snow on the roof, causing water to run down and refreeze at the edge of the roof. Over time, this can create a thick layer of ice that can cause damage to the roof and even leak into the house.

The first sign of an ice dam is often the formation of icicles on the edge of the roof. While icicles may look pretty, they are a warning sign that water is not draining properly and may be backing up under the roof shingles. Other signs of an ice dam include water stains on the ceiling or walls, peeling paint or wallpaper, and damp insulation.

Preventing ice dams is much easier than dealing with them after they form. Here are some steps you can take to make sure your home isn’t susceptible to the problem:

1. Keep your gutters clean. Gutters filled with debris can cause water to overflow and freeze on the edge of the roof, leading to ice dam formation.

2. Insulate your attic. A well-insulated attic will keep the heat inside your house from melting the snow on the roof.

3. Ventilate your attic. Proper ventilation will help prevent heat buildup in the attic, which can contribute to ice dam formation.

4. Consider installing an ice and water shield. This is a type of roofing material that is designed to prevent water from seeping into the house if an ice dam forms.

If you already have an ice dam, there are a few things you can do to remove it:

1. Use a roof rake to remove snow from the edge of the roof. This can prevent more water from backing up and freezing.

2. Fill a pair of pantyhose with calcium chloride ice melt and lay it across the ice dam. This can help melt the ice and create a channel for water to escape.

3. Hire a professional. Removing an ice dam can be dangerous, especially if you have to climb on a ladder or walk on a slippery roof. It's best to leave this job to the professionals.

Ice dams are both a common and serious issue that can cause damage to your roof and home. Taking steps to prevent ice dams from forming is the best way to avoid this problem. If you do have an ice dam, there are ways to remove it, but it's important to be cautious and seek professional help if necessary.

Bob O’Donnell is the owner of O’Donnell Bros. Inc., a Bristol-based home improvement company established in 1975. Email your questions to info@odonnellbros.com with the subject line “Ask the Pro.” All questions may be considered for publication. To contact Bob for your remodeling needs, call O’Donnell Bros. Inc. at (860) 589-5155 or visit http://www.odonnellbros.com. Advice is for guidance only.