When Your Deck Stairs Wobble, Don't Wait — A Rotting Tread Repair Story
A wobbly staircase is one of those problems homeowners live with longer than they should.
It doesn't fail all at once — it just gets a little looser every season, until one day you're gripping the handrail on the way down instead of just walking. That's exactly the call I got this week: a deck staircase here in Broomfield,CO that was shifting side to side with every step, plus several stair treads that had rotted through from years of Colorado sun, snow, and moisture cycling.
Why deck stairs start to wobble
Side-to-side movement in a staircase is almost never a cosmetic issue — it's a structural one. A few common causes I look for:
Loose or failing fasteners at the stringers (the angled boards that support each step)
Rotting or split stair treads that no longer hold screws securely
Stringers that have shifted or lost contact with their support posts
Moisture damage at ground contact points, where wood sits closest to soil or gravel
On this job, it was a combination of the last two: the stair treads had deteriorated to the point of rotting, and that decay had loosened the connection points holding the whole staircase together. Once a few treads go, the entire structure loses rigidity — and that's when you start feeling that side-to-side sway.
How I fixed it
I started with a full structural assessment of the staircase — stringers, treads, railings, and ground contact points — to confirm exactly where the failure was happening. From there, the repair involved:
Removing every rotted stair tread and inspecting the stringers underneath for hidden decay
Replacing the deteriorated treads with new pressure-treated lumber, properly fastened at every stringer
Re-securing and reinforcing (cross brace the staircase posts) the connection points that had loosened, eliminating the lateral wobble
Testing the full staircase under load to confirm it was solid, stable, and safe to use
The result: a staircase that's tight, stable, and safe again — no more wobble, no more rotted boards waiting to give way under a foot.
Why this matters more than it seems
A wobbly deck staircase isn't just annoying — it's a fall hazard, especially with kids, guests, or anyone carrying something down the stairs. Rotting treads can look fine from a distance and still be one bad step away from breaking through. If your deck stairs move, creak, or just don't feel as solid as they used to, that's worth having looked at before it becomes a bigger repair — or an injury.
I handle deck and stair repairs like this throughout Lafayette, Louisville, Superior, Broomfield, Erie, Longmont and Boulder. Whether it's a full staircase rebuild or just a few rotted treads, I'll give you an honest assessment of what's actually needed.
If your deck stairs are wobbling, creaking, or showing signs of rot, reach out and let's get it fixed before it becomes a safety issue.
Making your TO-DO list a DONE list.
— Jeremy, Old Town Handyman & Home Solutions
