Ice dams are a frequent winter concern across New England. As winter storms become more unpredictable, understanding how ice dams form—and how to prevent them—can help reduce costly damage to your home or business.
What Are Ice Dams?
An ice dam is a buildup of ice along the roof’s edge. Heat escaping into the attic melts rooftop snow, which then refreezes at the colder eaves. As this cycle repeats, water becomes trapped behind the ice and can work its way under shingles and into the structure.
Why Ice Dams Are a Serious Concern
Ice dams can lead to serious issues including water damage, ruined insulation, stained ceilings, and mold growth. If left unaddressed, they may even weaken roofing materials and structural components, leading to expensive repairs.
Common Causes of Ice Dams
- Poor or uneven attic insulation that allows heat loss
- Limited attic ventilation that raises roof temperatures
- Blocked or debris-filled gutters
- Air leaks around attic penetrations such as pipes or wiring
Warning Signs to Watch For
- Large icicles forming along roof edges
- Water marks on ceilings or walls
- Peeling paint near the roofline
- Musty odors or visible mold in attic spaces
- Cold drafts or uneven indoor temperatures
Preventative Steps You Can Take
- Upgrade attic insulation to maintain consistent roof temperatures
- Improve ventilation with ridge and soffit vents
- Seal air leaks around fixtures and attic openings
- Keep gutters and downspouts clear of debris
- Use a roof rake to remove excess snow after storms
- Schedule annual inspections with qualified professionals
If an Ice Dam Develops
If you suspect an ice dam, take steps quickly. Remove excess snow where possible and monitor for leaks. Avoid chipping away ice, which can cause roof damage. Professional removal is the safest option.
