Why do my concrete steps lift in winter?

Water in the soil under the steps freezes and expands, and it pushes the steps up. The house stays put because its footings sit below the frost line, so the steps move and the house does not.

Why do my steps tilt away from the house?

Usually they are bearing on backfill, the loose soil placed against the foundation when the house was built. It keeps settling for decades, and frost moves it each winter. Steps poured on top of it settle and tip with it, and the gap at the house grows.

Is a gap between my steps and the house a problem?

It can be. The gap lets water run down the foundation wall. It is worth having someone look at it early.

Can lifted or tilted steps be fixed without a full rebuild?

If the steps settled in one piece and are not cracked through, they can sometimes be lifted back into position. That only lasts if the cause is dealt with first. If they are cracked through or keep moving, a rebuild on proper footings is the fix that holds. A free site visit tells you which one you have.

How do you stop steps from heaving?

Bear the steps on footings dug below the frost line, or tie them to the foundation itself. Add a compacted granular base and slope the ground so water runs away from the steps instead of sitting under them.

Why Concrete Steps Lift or Tilt in Winter

Your steps looked fine in October. By March one side is higher than the other, or the whole set has pulled away from the door. That is frost at work.

Here is what is going on under the concrete, and what actually fixes it.

What frost heave does to steps

Soil holds water. When the ground freezes, that water turns to ice and takes up more room, and it pushes up on whatever sits above it. When the ground thaws, the soil drops again, often unevenly.

Frost in Southern Ontario reaches about four feet down in a cold winter. Anything bearing above that depth rides up and down with the freeze and thaw. Anything bearing below it stays put.

Why the house stays put and the steps do not

Your house sits on footings that go below the frost line. Steps poured at the surface do not. So every winter the ground moves the steps while the house holds still, and the joint between them works open a little further.

That is why steps lift, tilt or pull away while the house itself looks perfectly fine. It comes down to what each piece is bearing on.

What makes it worse

Four things feed it:

Backfill. The soil beside a foundation was dug out when the house was built and put back loose. It keeps settling for decades, so steps poured on it settle and tip away from the door.
Poor drainage. Water that sits under or beside the steps has more to freeze. Ground that slopes toward the house, or a downspout that empties at the steps, gives frost more to work with.
A thin or missing base. Steps poured straight onto soil, with no compacted granular base, have nothing to drain the water away.
Clay. Heavy clay holds water and heaves in a hard freeze. Our guide to how the ground changes across Southern Ontario driveways covers why clay country is the hardest on a slab.

Signs frost is moving your steps

Check these after the ground thaws:

One side of a step sits higher than the other.
The steps tilt away from the door, or a landing has dropped.
A gap has opened between the steps and the foundation, or it is wider than last year.
Risers are no longer an even height. Uneven risers are the classic trip hazard.
Water runs into the gap at the house after rain or melt.

Why a patch does not hold

You can fill a gap or grind down a high edge, and it will look better for a while. But the steps are still bearing on ground that moves.

Resurfacing helps with a damaged surface, not with steps that are moving. Our guide to crumbling steps, and whether to repair or replace them shows how to tell the two apart.

What a lasting fix looks like

The fix goes to the cause, which is what the steps bear on:

Footings below the frost line. New steps that attach to the house get footings dug to about 1.2 metres, so they stay put with the house.
Or tie them to the structure. Where it is the sounder detail for the site, the steps are doweled into the foundation wall instead.
A compacted granular base. It drains the water away from under the slab instead of holding it.
Slope that sheds water. Ground and treads that shed water, not collect it.

Freestanding walkway slabs are different. Nothing pins one edge in place, so they can float on a drained, compacted base. Which situation you have is the first thing to check. Our walkways and steps page explains how we build each one.

Lifted steps: sometimes an option

If a set of steps settled in one piece and is not cracked through, it can sometimes be lifted back into position instead of torn out. That is usually a smaller job than a rebuild. It only holds if the cause of the movement is dealt with first, so we check the ground and the drainage before recommending it.

If the steps are cracked through, keep moving, or are no longer safe to walk on, the answer is a rebuild on proper footings.

What changes the cost

We do not publish a flat price for steps, because no honest one exists. The number moves with how many risers there are, how tall the whole set stands, whether it needs footings or dowels into the foundation, what is being torn out, and the finish. Our cost factors guide for walkways and steps goes through each piece.

Get a straight answer for your steps

Why steps move depends on what a photo cannot show: what they are bearing on, and where the water goes. That takes someone looking at the steps, the gap at the house and the ground around them.

That is what the free site visit and written quote are for. We tell you whether the steps need a lift, a repair or a rebuild, with the reasons in writing. Our crews are union-certified and we back our labour with a lifetime warranty. Ask for a free written quote.