In high-snow environments, ice dams are more than just a winter nuisance; they are a structural hazard. At Snow Country Roofing, we see the damage they cause every year. Understanding why they form is the first step toward protecting your investment.
Why Do Ice Dams Form?
An ice dam is a ridge of ice that forms at the edge of a roof and prevents melting snow (water) from draining off.
The process is driven by a temperature imbalance:
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Heat Loss: Heat escapes from your living space into the attic due to poor insulation or “air leaks.”
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The Melt: This warm air heats the top of the roof deck, melting the bottom layer of snow.
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The Freeze: The meltwater flows down the roof until it reaches the eaves (the overhang), which are not heated by the attic.
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The Dam: The water refreezes at the cold edge, creating a wall of ice. As more snow melts, water pools behind this wall, eventually backing up under your shingles and leaking into your walls and ceilings.
How to Prevent Them
Prevention is always cheaper than a restoration project. Here is how you stop the cycle:
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Insulate the Attic Floor: Keep the heat in your house where it belongs. This keeps the roof deck cool and prevents the initial snow melt.
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Seal Air Leaks: Use spray foam or caulk to seal gaps around recessed lights, plumbing stacks, and chimneys that allow warm air to bypass your insulation.
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Improve Ventilation: A “cold roof” is a safe roof. Proper ridge and soffit vents ensure that any heat that does escape is quickly flushed out by cold outdoor air.
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Install an Ice and Water Shield: When replacing a roof, we install a waterproof membrane under the shingles. While it doesn’t stop the ice from forming, it acts as a secondary barrier to keep the water out of your home.
Removal: Why “Steaming” Wins
When a dam has already formed, many homeowners reach for a shovel, a pickaxe, or even a chainsaw. This is a mistake.
The Danger of Mechanical Removal
Hacking at ice with a metal tool is a recipe for disaster. Shingles become brittle in the cold; one misplaced strike can shatter a shingle, puncture your underlayment, or tear your gutters right off the house. Furthermore, climbing a ladder in icy conditions is a significant safety risk.
The Superiority of Low-Pressure Steaming
At Snow Country Roofing, we use low-pressure steam. Here is why it’s the industry standard:
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Gentle on Materials: Steam melts the ice without any physical impact, preserving the integrity of your shingles and granules.
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Efficiency: It cuts through thick ice like a hot knife through butter, allowing us to remove the dam in large chunks safely.
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Thermal Safety: Unlike high-pressure power washers (which can actually drive water deeper into your roof), steam uses high heat and low pressure to dissipate the ice harmlessly.
Don’t let an ice dam turn into a flood. If you see heavy icing on your eaves or water stains on your ceiling, give us a call. We’ll clear the ice safely and help you find a long-term solution to keep your roof dry all winter long.
