Ice dams in Seattle form when warm attics melt snow that refreezes at eaves, forcing water under shingles

https://telegra.ph/Signs-Your-Renton-Roof-Has-Storm-Damage-Signs-Your-Renton-Roof-Has-Storm-Damage-06-03

Ice dams in Seattle form when warm attics melt snow that refreezes at eaves, forcing water under shingles. Continuous soffit-to-ridge ventilation, air sealing, and eave ice-and-water shield stop hidden winter leaks.