Winter storm aftermath: How to prevent ice dams and roof leaks
Ice dams cause roof leaks but insulation and ventilation help prevent them.
A long, cold winter can leave homeowners dealing with a heavy buildup of snow and ice on their roofs.
In some cases, that can lead to ice dams—an issue that could cause serious damage if left unchecked.
What are ice dams?
Ice dams form when snow on a roof melts and refreezes at the edges, creating a barrier that traps water.
That water can seep into homes, damaging ceilings, insulation, and walls. In some cases, it can even weaken the structure. Mold and mildew can also become a problem if moisture isn't properly managed.
How to prevent them
Experts say the best way to prevent ice dams is to keep a consistent temperature on the roof by reducing heat loss from inside the home.
That can be done by:
Sealing air leaks to prevent warm air from escaping into the attic.
Adding insulation to keep the indoor heat from reaching the roof.
Ensuring proper ventilation to balance roof temperatures.
What to do if there's already snow on the roof
Removing excess snow can help, but it comes with risks. Using a roof rake or broom is an option; however, experts warn that improper use could damage shingles.
Hiring a professional is the safest approach, though it can be costly. If water is already leaking into the home, calling an expert to mitigate the damage is highly recommended.
What not to do
Throwing salt or other melting agents on the roof may seem like the quickest fix, but experts warn it could do more harm than good.
Many of these products are corrosive and could damage shingles and gutters—a costly mistake that insurance may not cover.
Other winter hazards
Heavy snow can cause more than just ice dams. Homeowners should also ensure exhaust vents remain clear, including those for furnaces, water heaters and dryers.
Blocked vents can cause carbon monoxide buildup inside the home, which can be deadly.
Officials recommend keeping vents clear and ensuring carbon monoxide detectors are working throughout the winter season.
With files from Michael Vann, a video journalist for The Weather Network.