Ice dams are a common and costly problem for Minnesota homeowners. Understanding how they form and how to prevent them can save you thousands in repairs.
What Are Ice Dams?
Ice dams form when heat escapes through your roof, melting snow on the upper sections. This meltwater runs down to the colder eaves, where it refreezes, creating a ridge of ice. As more water backs up behind this dam, it can seep under shingles and into your home.
Signs of Ice Dam Damage
• Icicles hanging from gutters or eaves
• Ice forming behind gutters
• Water stains on ceilings or walls near exterior walls
• Peeling paint or warped siding
Prevention Strategies
Improve Attic Insulation: Keeping heat inside your living space (and out of the attic) is the most effective prevention. Aim for R-49 to R-60 insulation in Minnesota attics.
Ensure Proper Ventilation: Cold air should flow from soffit vents, up through the attic, and out ridge or roof vents. This keeps the roof deck cold and prevents uneven snow melt.
Seal Air Leaks: Heat escapes through gaps around light fixtures, plumbing stacks, attic hatches, and ductwork. Sealing these leaks keeps heat where it belongs.
Install Ice and Water Shield: This waterproof membrane under shingles at the eaves provides a backup barrier if ice dams do form.
If Ice Dams Form
• Don't Hack at Ice: You can damage shingles and gutters.
• Use Calcium Chloride: Fill a nylon stocking with calcium chloride and lay it across the dam to melt a channel for drainage. Never use rock salt—it damages shingles.
• Call Professionals: For serious ice dam removal, hire experienced professionals with steam equipment.
Long-Term Solutions
If ice dams are a recurring problem, it's time to address the root cause. We can assess your attic insulation and ventilation and recommend targeted improvements.