The Winter of the Ice Dams: What a Record Season Taught Us
Every Michigan winter makes a few ice dams. The winter of 2013 to 2014 made them everywhere. Deep snow that never left the roof, cold that never broke, and by February water was staining ceilings in neighborhoods that had never seen it. A cautionary note from the record.
Ask anyone in southeast Michigan who owned a house through the winter of 2013 to 2014 and they will tell you about the ice. Snow came early, kept coming, and the cold in between was deep enough that almost none of it melted off the roofs between storms. The exact totals belong to the official climate record. See the National Weather Service Detroit/Pontiac office records. What we can write from the roofing side is what that combination produced: the most widespread ice dam season in recent metro Detroit memory, with ridges of ice at the eaves of ordinary houses and meltwater backing up under shingles across the region. This note is part of the same file as our storm damage service page: weather on the record, and what it did to roofs.
01 /The recipe that winter perfected
An ice dam needs three ingredients, and the winter of 2013 to 2014 supplied all of them in quantity for months at a stretch:
- A deep, persistent snowpack on the roof. Snow is both the water supply and the insulating blanket that traps escaping house heat against the shingles. That winter, roofs in Macomb County carried snow more or less continuously from the start of the season into March, so the supply never ran out.
- Sustained cold at the eaves. The overhangs of a roof sit beyond the heated envelope of the house, so they stay near the outdoor temperature. In a winter with long unbroken stretches below freezing, the eaves become a permanent freezing zone that turns every drop of meltwater into ice.
- Heat leaking from the house. This is the ingredient the weather does not control. Warm air escaping into the attic through gaps, light fixtures, and thin insulation warms the upper roof enough to melt the underside of the snowpack, even on days when the air outside never gets near thawing.
02 /The mechanism, briefly
The physics are simple and unforgiving. House heat melts the bottom layer of the snowpack high on the roof. The meltwater runs downslope beneath the snow until it crosses onto the cold overhang, where it refreezes. Each day the cycle repeats, and the ice at the eave grows into a dam. Behind the dam, meltwater pools. Shingles are built to shed water running downhill, not to hold a standing pond, so the pooled water works sideways and uphill under the courses, through nail holes and joints, and into the decking, the insulation, and eventually the ceiling below. The dam itself rarely damages the roof. The pond behind it does.
03 /What made that season different
A normal Michigan winter interrupts the cycle. A January thaw clears the roofs, a rainy week flushes the eaves, and the dam-building clock resets. The winter of 2013 to 2014 offered almost no such breaks. The snowpack persisted for weeks at a time and the cold held, so the melt and refreeze cycle ran daily on any house losing heat into its attic, compounding instead of resetting. Dams that most winters would top out at a few inches kept growing. Houses that had never dammed before, because an ordinary winter never stressed them long enough, finally showed their weak attics.
That is the real lesson of a record season: it audits every roof at once. In a mild winter, only the worst attics make ice. In a winter like that one, any roof with meaningful heat loss makes ice, and the difference between a stained ceiling and a dry one comes down to insulation, air sealing, and ventilation decisions made years earlier.
Ice dam water rarely announces itself in February. It soaks insulation, wicks along framing, and shows up in April as a brown ceiling ring, peeling paint at a wall top, or a musty attic. If a past winter left icicles the size of your arm at the eaves and nobody has looked under the shingles since, the evidence may still be up there. A free inspection settles it, with photos, at no cost or obligation.
04 /What the record season taught us
Three things, and they still hold. First, ice dams are a house problem wearing a weather costume. The winter supplies snow and cold, but the attic supplies the melt, and the roofs that stayed dry through 2013 to 2014 were overwhelmingly the ones with cold, well sealed, well vented attics. Second, the fix is almost always a repair scale project, not a new roof. Damaged decking, saturated insulation, and torn underlayment at the eaves fall within the repair work on our published price sheet at $350 to $3,200, with larger or complex repairs running higher. Third, insurance is case by case. Some policies can cover sudden interior water damage from an ice dam while treating the roof itself as maintenance; our insurance claims guide walks through how that conversation works, and we can meet your adjuster on site. We never promise what a carrier will decide.
We keep this note deliberately short on prevention detail, because the guides carry that load: the guides library covers ice dam prevention, attic ventilation, and winter prep step by step. If you want to know where your roof stands before the next hard winter runs its audit, book a free roof inspection and get the answer in writing. If the eaves are already failing and repair math is the question, the 60-second cost calculator uses the same figures we publish, and the roof repair page covers the fix side. And if a thaw ever sends water through a ceiling mid-winter, we answer 24/7 for emergency tarping.
- National Weather Service, Detroit/Pontiac forecast office: southeast Michigan forecasts, warnings, and event records. weather.gov/dtx
- National Weather Service, Detroit/Pontiac forecast office. weather.gov/dtx