Ice dams begin thermally, not magically. Warm attic pockets spike roof deck temps above freezing while eaves remain cold—liquid water freezes at the gutter line and creeps upslope.

Priority checklist

  • Seal attic bypasses (top plates, recessed lights, chase walls).
  • Ensure insulation depth meets modern stacks without blocking soffit vents.
  • Balance ridge and box vents—or upgrade thoughtfully when hips complicate airflow.
  • Flash valleys with Ice & Water Shield when replacing roofs proactively.

Mid-season emergencies still happen—that’s why Westside Developers provides responsive ice & snow removal.