Not every moving step needs the whole flight taken down. Where the rest measures true and the base under the bottom course is sound, a single rocking tread or a shifted riser can be lifted, re-bedded and tied back in for a fraction of a rebuild. Deciding which you have takes a tape and ten minutes.
The test is whether the rest of the flight is still true. We measure every rise, put a level across each tread and check the bottom course for movement.
If the only thing out of place is one course, and the base beneath the flight has not shifted, that course can be lifted, re-bedded on fresh material and pinned back to the one below. That is a few hundred dollars and a single visit.
What rules it out is a bottom course that has settled, because every rise above it has then changed, or rises that already vary across the flight, because correcting one makes the mismatch worse rather than better.
We will tell you which of those you have before quoting rather than starting a small job and discovering the big one halfway through. See what a full step rebuilding involves, how a stair landing affects the top rise, and what wall caps need by comparison.
Loose Risers
How It Runs
Four steps to a tread that stops rocking
Measure the whole flight
Every rise and every tread gets checked, because fixing one course only works if the rest of the flight is already true.
Lift the moving course
The affected blocks come up cleanly so the bedding beneath can be seen and whatever caused the movement can be dealt with.
Re-bed on fresh material
New bedding goes in to a consistent depth rather than packing the void, which is what makes the fix hold past the first frost.
Pin it back in
The course is pinned or adhered to the one below so foot traffic cannot walk it forward again over the following seasons.
Do Not Pack It
Why shimming a rocking step never lasts
The instinct with a rocking tread is to pack something under the low corner, and it works for about one winter. Packed material is not compacted material; it consolidates under load, water gets into the gap and freezes, and the tread is rocking again by spring.
Lifting the course and re-bedding it properly takes an hour longer and it is the difference between a repair and a delay. See how uneven pavers fail the same way when they are shimmed, what step rebuilding costs across a flight, and how porch repair deals with the top landing.
Yes, if the rest of the flight still measures true and the bottom course has not settled. If either of those has gone, correcting one course makes the rises worse.
It holds about one winter. Packed material is not compacted, it consolidates under load and water freezes in the remaining gap, so the tread rocks again by spring.
Usually water getting in behind with nowhere to drain, or nothing tying that course to the one below so foot traffic slowly walked it forward.
Around $300 to $700 including the visit. A full flight rebuild runs $900 to $2,500, which is why measuring first is worth the ten minutes.
Yes, because the same blocks go back in the same order and the same way round. Only the bedding underneath them is new.
If the course it is fixed to is moving, yes. It comes off, the step is rebuilt, and it goes back. A rail bolted to a loose course is doing the opposite of its job, so leaving it in place is not the saving it looks like.
