Frost Heave: Why Shallow Footings Lift Every Winter

Based on more than 1,200 written inspections and nearly 10,000 estimates across the Quad Cities in the last ten years.

The seasonal tell: it moves in winter, settles in summer

If there’s one clue that points straight to frost, it’s timing. A crack that opens up in the cold months and closes again when the ground thaws, a garage wall that works its joints apart a little more each winter, steps or a porch that lift and drop with the seasons — that rhythm is the signature of frost heave. Damage that tracks the calendar is telling you the cause is the freeze, not just the load.

What frost heave actually is

In our climate the ground freezes to a real depth every winter — well below the surface. When soil that’s holding moisture freezes, it expands, and that expansion has to go somewhere: it pushes up. Anything sitting in that frozen zone gets lifted along with it. It isn’t the foundation being weak; it’s the ground itself swelling and shoving. And because water is what makes soil swell when it freezes, wet ground is far more prone to it than dry, well-drained ground.

Why shallow footings are the victims

A properly-built foundation puts its footing down below the depth that freezes, so the frozen zone can heave all it wants and the footing sits calmly beneath it. The trouble comes with things built shallow: many garages, porches, front steps, additions, and slabs rest on footings that never reached below the frost line. Those are the ones that lift, crack, and re-crack every year — not because someone did something recently, but because they were sitting in the frost zone all along.

Why you can’t just brace it

This is the part that separates a real fix from a band-aid. Bracing, straps, or patching a frost-heaved element fights the wrong force — the ground is going to keep freezing and lifting no matter how you reinforce what’s on top of it. The durable answers address the actual cause: getting the support down below the frost depth so the freeze passes harmlessly beneath it, and keeping water away so the soil isn’t saturated when it freezes in the first place. Sometimes that means correcting grade and drainage; sometimes it means rebuilding a shallow footing properly. Either way, the goal is to take the element out of the frost’s reach — not to hold it in place while the frost keeps pushing.

What to do

If something on your property cracks and lifts on a seasonal schedule, note the timing and where the water goes around it — downspouts, grade, and pooling all feed the problem. Then get an evaluation that treats it as what it is: a depth-and-water issue, not a “brace it and hope” one. If you’ve been quoted a reinforcement for something that’s clearly heaving each winter, a second opinion is worth it. Garage versions of this show up on our garage wall & floor page, and the water side starts with drainage.