What Is an Ice Dam?

An ice dam is a ridge of ice that forms along the edge of a roof, preventing melting snow from draining properly. When water becomes trapped behind the ice dam, it can seep underneath shingles and into the roofing system, causing leaks and interior damage.

Ice dam roof damage is one of the most common winter roofing issues homeowners face after snowstorms—especially in regions like the Mid-South, where homes are not built for sustained snow and ice.

How Ice Dams Form During Snowstorms

Ice dams form due to a combination of snow accumulation, heat loss, and freezing temperatures:

1. Snow accumulates on the roof during a storm
2. Heat escapes from the home, warming parts of the roof
3. Snow melts and flows toward the roof edge
4. Water refreezes near the eaves where temperatures are colder
5. Ice builds up, blocking proper drainage

Once this cycle begins, additional melting snow has nowhere to go and is forced back under the shingles.

Why Ice Dams Are Common in the Mid-South

Ice dams are especially problematic in the Mid-South because:

• Homes are designed for milder winters
• Attic insulation and ventilation may be insufficient
• Temperatures fluctuate above and below freezing
• Snowstorms are often followed by sunny days

These conditions create ideal freeze-thaw cycles that accelerate ice dam formation.

How Ice Dams Cause Roof Leaks and Interior Damage

Ice dams allow water to bypass the roofing system’s protective layers. As water backs up:

• Shingles lose their ability to shed water
• Roof decking absorbs moisture
• Insulation becomes saturated
• Water travels into ceilings and walls

This can result in drywall damage, mold growth, and costly structural repairs.

Why Ice Dam Damage Often Goes Unnoticed

Ice dam damage is often hidden because:

• Leaks may not appear immediately
• Water travels along framing before becoming visible
• Damage can occur under intact-looking shingles

Many homeowners don’t realize there’s an issue until weeks later—often after the snow has melted.

To better understand the broader risks, learn more about how snowstorms impact roofs in the Mid-South by reading our main guide on snowstorm roof damage.

When to Schedule a Professional Roof Inspection

You should schedule a roof inspection if:

• Ice dams were visible along your roofline
• Icicles formed unevenly
• You notice ceiling stains or damp smells
• Your home experienced prolonged snow coverage

Professional inspections can identify ice dam roof damage before it worsens.

Schedule a Free Post-Storm Roof Inspection

Ice dam damage rarely fixes itself.
Summit Roofing & Restoration offers free post-storm roof inspections to help homeowners identify damage early and prevent expensive repairs.

👉 Schedule your free inspection today