What Ice Dams Are and Why Arkansas Is Vulnerable
An ice dam forms when heat escaping from a warm attic melts snow on the upper roof surface. That meltwater flows down the slope until it reaches the cold eave overhang — the part of the roof that extends past the exterior wall and has no heated space below it. There, the water refreezes, forming a ridge of ice at the eave edge. Subsequent meltwater backs up behind that ice ridge and has nowhere to go except under the shingles and into the home.
Most Arkansans think this is a Minnesota problem. It is not — it is a warm-attic problem, and Arkansas homes are often more susceptible than northern homes for a specific reason. Homes in the River Valley and central Arkansas are typically built with far less attic insulation than homes in colder climates, because severe winters are rare here. An R-19 attic that performs adequately for 48 typical Arkansas winters will hemorrhage heat into the roof deck during the one historic event — like February 2021 — when it actually matters.
The February 2021 ice storm deposited accumulations of snow and ice across central and north-central Arkansas that the region had not seen in decades. River Valley homes with under-insulated attics melted snow from below while outside temperatures kept the eaves frozen. Ice dams formed across thousands of homes that had never experienced the problem before. Storm damage claims from that event were still being processed months later.
Prevention: Insulation and Ventilation Work Together
The principle behind ice dam prevention is simple: keep your entire roof deck cold and uniform during winter precipitation events. A cold, uniform roof deck does not melt snow unevenly. Meltwater does not form. Ice dams cannot occur.
Achieving a cold, uniform roof deck requires two things working together:
Adequate attic insulation. The current Arkansas energy code recommends R-49 for attic floors in Climate Zone 3 (most of the state). Many older homes in the River Valley have R-11 to R-19 — the insulation that was code-minimum when those homes were built decades ago. Upgrading to R-49 dramatically reduces heat transfer from living space to attic. The insulation upgrade pays for itself in energy savings alone within 5 to 7 years, and ice dam protection is a free side benefit.
Proper attic ventilation. Even with good insulation, a ventilated attic that keeps the roof deck close to outside air temperature is the second line of defense. Soffit intake plus continuous ridge exhaust creates the airflow that equalizes roof deck temperature. An attic at 28°F cannot melt snow regardless of how warm the living space below is.
Ice and water shield at eaves and valleys. Arkansas building code requires ice and water shield at eaves and valleys on new installations. If your roof was installed before this was standard or by a contractor who skipped it, you have no physical backstop when water backs up under shingles. Every SMI re-roofing project includes properly installed ice and water shield as a non-negotiable component.
Heat cables installed along eave edges are an option for specific problem areas — deeply shaded north-facing eaves, for instance — but they are not a substitute for the insulation and ventilation work that addresses the root cause. Heat cables also require electricity to run and can fail.
What to Do If You Have an Ice Dam Forming
During an active ice event with a dam forming, your options are limited and the wrong actions cause as much damage as the dam itself:
- Do NOT chip the ice off with a hammer, hatchet, or any tool. This destroys shingles and injures people every year. The shingles beneath an ice dam are already stressed — mechanical impact will crack or puncture them.
- Do NOT use a pressure washer on a frozen or partially frozen roof. The water refreezes, worsens the dam, and the pressure can lift shingles.
- Do: call a professional for steam removal. Steam ice dam removal is the safe, effective method. A low-pressure steam unit melts the dam without damaging shingles. This is the only method SMI recommends for active dam removal.
- Do: use calcium chloride ice melt in a nylon stocking laid across the dam. This creates a channel for water to escape through the dam rather than backing up further. Use calcium chloride only — not rock salt, which damages shingles and vegetation.
- Do: address the interior. If water is entering the home, place buckets, move valuables, and protect flooring. Ice dam water intrusion can saturate insulation and begin mold growth within 24 to 48 hours of the first moisture contact.
Insurance and Ice Dams in Arkansas
Ice dam damage is typically covered under the dwelling coverage section of standard Arkansas homeowners policies as a sudden and accidental event — the same category as storm damage. Document everything before any repairs begin: photograph the ice dam from outside, photograph any interior water entry points, note the dates, and screenshot weather reports confirming the storm event.
Keep all damaged material in place until your adjuster inspects. SMI can inspect post-storm to assess ice dam damage and provide a written damage assessment for your insurance claim. When re-roofing after ice dam damage, this is the right time to upgrade insulation, ensure ice and water shield is properly installed at all eaves and valleys, and correct ventilation if it was deficient. Schedule your inspection and we will assess whether your current roof is prepared for the next severe winter event.