The answer to 'why is my shingles ice dams' is that ice dams form when heat escapes from your home and melts snow on your roof. As the melted snow runs down the roof, it refreezes at the roof's edge, creating a dam that traps more water and leads to leaks and damage. Common causes include poor attic insulation, air leaks, and inadequate ventilation.
Ice dams can cause significant damage to your roof, walls, and interior if left untreated. Signs of ice dams include icicles along the roof's edge, water stains on ceilings and walls, and shingles lifting or buckling. While some DIY solutions like removing snow or installing heat cables may help, ice dams are best addressed by a professional roofing contractor who can properly identify and fix the root cause.