The answer to 'roof ice dams' is that ice dams are ridges of ice that form at the edge of a roof, preventing melting snow from draining properly. This can lead to water backing up under the roof shingles and causing leaks and damage. Common causes include poor insulation, inadequate ventilation, and heavy snowfall.
Symptoms of ice dams include icicles hanging from the roof, water stains on the ceiling or walls, and ice buildup on the roof edge. Solutions include improving insulation and ventilation, manually removing ice dams, and installing heat cables or roof heating systems. However, severe ice dam issues should be addressed by a professional roofing contractor to prevent further damage.