The answer to 'why is my metal roof ice dams' is that ice dams are a common issue with metal roofs during the winter months. Ice dams form when snow and ice melt on the upper portions of the roof, then refreeze at the roof's edge, creating a barrier that prevents proper drainage. This can lead to water backing up under the roofing material and causing leaks and damage.
Some common causes of ice dams on metal roofs include inadequate insulation, poor ventilation in the attic, and the metal roof's tendency to heat up faster than other roofing materials, leading to uneven melting and refreezing. Homeowners may notice icicles forming along the roof's edge, water stains on the interior walls or ceilings, and even water dripping into the home as signs of an ice dam problem.