Act soon · The cost of this rises the longer it waits.
Loose, lifting, or cracked stair nosing
Also searched as: stair edge lifting, broken nose on step, tread edge cracked
What it looks like
The front edge of a tread has lifted, split along its length, or moves when pressed. On a retreaded flight it is often a separate nosing strip pulling away from the tread behind it.
What causes it
In rough order of likelihood. Each one has a tell — the observation that separates it from the others.
A retread capped with flooring plus a separate nosing strip
How to tell: You can see a joint line a couple of inches back from the front edge. This assembly relies entirely on adhesive and it is the most common failure we are called to.
The nosing overhangs too far
How to tell: More than about 25 mm of projection. Unsupported leverage, every step, until it splits. It is also the reason the flight would fail an inspection.
Adhesive failure under a glued nosing
How to tell: A hollow sound when tapped along the front edge.
The tread itself has split at a fastener
How to tell: A crack running with the grain from a nail or screw.
What it actually means
The nosing takes more load than any other part of a stair, on the smallest bearing area. When it moves, it is the front edge of the step someone is standing on. It is also the detail that most often reveals a flight was capped rather than rebuilt.
Can it be fixed?
Depends what caused itA single failed nosing can be replaced. When several are going on a capped flight, the assembly is the problem, not the individual pieces, and rebuilding with solid treads costs less than replacing nosings one at a time for the next five years.
What you can do yourself
- Tap along the front edge of every tread and listen. Hollow means the bond has gone even where nothing is visibly loose.
- Measure the projection. Much past 25 mm and it is both a trip hazard and a code problem.
- Do not screw a lifting nosing back down through the face. It splits, and the hole becomes the next failure.
When to call someone
Any nosing moves underfoot, more than one is loose, or you can see a joint line behind the front edge on a flight that was capped rather than rebuilt.
The work involved
Hardwood Stairs
Box stairs, open-riser, replacement treads over carpet, curved flights, and full stair rebuilds. The stair is the first thing guests touch. We treat it as millwork, not leftover flooring.
From $380–$850 per step, installed
Read further
Hardwood stair nosings and floor transitions
Why the nosing, reducer, and landing detail make or break a hardwood stair and a hardwood install.
Hardwood stairs and Ontario Building Code
Rise, run, nosing, graspable handrails, and guards — the code details that get beautiful GTA stairs failed at inspection.
Often confused with
Written from 15+ years of GTA callouts, not from a manufacturer's brochure. Every diagnosis here still ends with someone looking at the actual floor — a photograph and a moisture reading beat any web page, including this one.