Ice Dams on Michigan Roofs: Causes, Safe Steam Removal, and Interior Damage Prevention
Ice dams are one of Michigan's most costly winter hazards. Learn how attic thermal dynamics cause ice buildup and why pressure washers destroy your roof.
An ice dam forms when attic heat warms the roof deck, melting underside snowpack. Meltwater flows down the roof until it reaches the cold eave overhang, where it refreezes into an impermeable ice ridge.
Why Trapped Water Leaks Inward: As snow continues melting above the dam, water pools into a pond behind the ice ridge. Shingle roofs are designed to shed downhill water, not hold standing ponds. Water seeps backward under shingles, finding nail penetrations and pouring into attic insulation.
Why Steam is Superior to Mechanical Hacking: Chisels, axes, and salt pucks damage shingles, puncture gutters, and create chemical runoff that kills foundation landscaping. True low-pressure steam operates at 290°F with minimal pressure, cutting ice cleanly like a laser without touching shingle granules.
Long-Term Prevention: Air-seal attic bypasses (recessed lights, plumbing stacks), upgrade attic insulation to R-49 or R-60, and ensure balanced soffit-to-ridge ventilation.
All educational articles published by Michigan Water Damage are reviewed by certified structural drying technicians and aligned with the ANSI/IICRC S500 and S520 industry standards.