Why Ice Dams Cause Roof Leaks During Winter

Winter roof leaks are one of the most common issues homeowners experience during colder months — and in many cases, the cause isn’t missing shingles or storm damage. It’s ice dams.

We’ve been getting a high volume of calls from homeowners dealing with winter leaks who don’t understand why water is getting inside. Ice dams are often the reason.

What Is an Ice Dam?

An ice dam forms when snow on your roof melts and refreezes near the edges of the roof. This creates a buildup of ice that blocks melting snow from draining properly.

When water gets trapped behind that ice, it can work its way under your shingles and into your home.

Why ice dams lead to leaks & why they are caused:

  • Heat escaping from your attic
  • Poor attic insulation
  • Inadequate roof ventilation
  • Repeated freeze-and-thaw cycles

As snow melts higher on the roof and refreezes at the colder eaves, water backs up under the roofing system instead of flowing off safely.

Common Signs of Ice Dams

  • Large icicles hanging from gutters
  • Ice buildup along the roof edge
  • Water stains on ceilings or walls
  • Dripping during warmer winter days

What Homeowners Should Avoid

Trying to chip ice off the roof or pour hot water on ice dams can damage shingles and create safety risks. These temporary fixes often make the problem worse.

How Ice Dams Are Prevented Long-Term

While ice dams can sometimes be managed short-term, the most effective long-term solutions usually involve:

  • Proper attic insulation
  • Improved ventilation
  • Ice and water shield installed under the roofing system

These protections are commonly addressed during a roof replacement, especially on homes that experience repeat ice dam issues.

How JB West Can Help

At JB West Roofing & Construction, we don’t just stop leaks — we identify why they’re happening. If ice dams are causing recurring winter leaks, we can assess whether repairs are enough or if a replacement solution would better protect your home long-term.

If you’re experiencing leaks or ice buildup this winter, it’s best to have your roof inspected before more damage occurs.

Looking for a roof replacement company?

Are you ready to partner with a professional roof replacement company that is known for consistency, durability, and long-term results? If so, JB West is here to help.  Contact us today to schedule a free consultation with our team.

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