How Does Ice Cause Damage to Roofing Materials?

Ice damage starts with water. When temperatures drop below freezing, any moisture trapped in small gaps or under shingles turns to ice. Water expands by about nine percent as it freezes, and that expansion pushes outward against whatever surrounds it.

As temperatures rise and fall, the ice melts and refreezes repeatedly. Each cycle pries the opening a little wider. Over time, hairline cracks in flashing or seams between roofing panels grow into gaps large enough for liquid water to flow through.

Flashing is the metal pieces that seal roof edges, valleys, and penetrations like chimneys or vents. Ice can push flashing away from the roof surface, breaking the sealant underneath. Once that seal is broken, water has a direct path into the structure.

Valleys, where two roof slopes meet, collect runoff and are especially vulnerable. Ice buildup in a valley can force water sideways under the shingles on both slopes. This type of damage often goes unnoticed because the leak appears far from the actual entry point.

If you notice signs of a roof leak, act quickly. Move furniture away from the area, place buckets under drips, and remove wet items to prevent further damage. You can also tarp the affected roof section to keep out additional moisture, but only if it is safe to do so.

The pros can assess the extent of the damage and dry out the affected areas. They usually start by removing standing water and setting up drying equipment, then address the roof repair separately. Document the damage with photos for your insurance claim, since policies vary, and your insurer decides what is covered.

• Take photos of the leak, stains, and damaged shingles
• Remove wet belongings from the area
• Set up fans or dehumidifiers if you have them
• Keep records of any temporary repairs you make
• Contact a roofing professional for the actual repair