If you live in Wisconsin long enough, chances are you will eventually deal with ice dams.
An ice dam is a ridge of ice that forms along the edge of a roof during winter. This ridge prevents melting snow from draining properly.
Instead of flowing off the roof, the water becomes trapped behind the ice.
When that water backs up under shingles, it can leak into the home and cause damage.
As a contractor working across Milwaukee, Waukesha, and Madison, ice dams are one of the most common winter roofing problems I see.
Ice dams form when three conditions happen at the same time.
Once ice begins building along the roof edge, water can back up under the shingles.
Ice dams are especially common in colder regions like Wisconsin because winter conditions often create the perfect environment for them to form.
Several factors contribute to the problem.
Large snowfalls leave thick layers of snow sitting on the roof.
The more snow present, the more water can be produced when it begins melting.
When warm air escapes into the attic, it heats the underside of the roof.
This warmth melts the snow sitting on top of the roof surface.
The edges of the roof are usually colder than the center because they extend beyond the heated interior of the home.
When melted snow reaches the edge, it refreezes.
Over time this creates a wall of ice.
Ice dams can cause several types of roofing problems.
The most obvious issue occurs when water works its way under shingles.
Once inside, it can damage ceilings, walls, insulation, and flooring.
Ice buildup can lift shingles and weaken roofing materials.
Repeated freeze cycles can also loosen flashing and nails.
When water enters the attic, insulation can become saturated.
This creates conditions where mold may develop.
Large icicles and ice buildup can also damage gutters and fascia boards.
This can lead to additional exterior repair costs.
Homeowners often notice ice dams before they realize they are causing damage.
Common warning signs include:
If you notice these signs, it is a good idea to have the roof inspected.
Preventing ice dams usually requires addressing the root causes.
Insulation helps prevent warm air from reaching the roof surface.
When insulation is installed properly, the roof temperature stays more consistent.
Good ventilation allows cold air to circulate through the attic.
This helps prevent snow from melting unevenly on the roof.
Air leaks around light fixtures, attic hatches, and wiring can allow warm air to enter the attic.
Sealing these gaps can reduce heat transfer.
In some situations, safely removing snow from the roof can help reduce ice buildup.
Roof rakes are sometimes used to clear snow near the roof edge.
A professional roof inspection can identify factors that contribute to ice dam formation.
These may include:
Fixing these issues early can reduce the likelihood of winter roof damage.
Ice dams form when warm air in the attic melts snow on the roof. The melted water flows downward and refreezes along the colder roof edge.
Ice dams can cause water leaks, insulation damage, mold growth, and deterioration of roofing materials.
Yes. Heavy ice buildup can pull gutters away from the roof or damage fascia boards.
Homeowners should be cautious. Climbing onto icy roofs can be dangerous. Professional removal is often safer.
Solutions often include improving attic insulation, installing proper ventilation, sealing air leaks, and repairing roofing materials.
T.R. Fullerton is a Wisconsin contractor and the owner of StyleCraft Renovations. He works with homeowners throughout Milwaukee, Madison, and Waukesha helping them improve and protect their homes with quality roofing, siding, windows, and exterior remodeling.
If you are dealing with ice dams or want to prevent winter roof problems, a roof inspection can help identify potential issues.
StyleCraft Renovations helps Wisconsin homeowners evaluate roof conditions and improve roofing systems to handle harsh winter weather.
Call (262) 470-1803 to schedule a roof inspection or discuss your roofing project.
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