A stair tread that shifts under your foot is the kind of repair I used to put off, until a tenant called me at nine in the evening to say a step on the back stairwell felt like it was about to give way. That was at property number 4, a 1998-built wood-frame duplex, and it took me about 45 minutes and roughly 800 yen in screws to fix it for good.
Loose treads almost never mean the staircase is failing structurally. In my experience across 9 rental properties over more than 15 years, it is fasteners working loose after a decade or two of foot traffic and Japan’s humid rainy season swelling and shrinking the wood. I have now repaired 14 loose treads on my properties, and the fix is nearly the same every time.
Why Stair Treads Come Loose
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Most staircases built before the early 2000s were assembled with nails rather than screws, and nails simply back out over time as wood expands and contracts. Add 15 to 20 years of tenants going up and down multiple times a day, and the friction holding those nails in place weakens. In humid months the wood swells and the gap tightens temporarily, which is why a lot of owners assume the problem fixed itself, then the squeak comes right back once the drier months arrive.
Tools and Materials You Will Need
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This is a job you can knock out in under an hour with a short shopping list. On all my properties I keep these on hand specifically for stair calls:
- Cordless drill driver with a Phillips bit
- 65mm coarse-thread deck screws, about 8 per tread
- Wood glue rated for structural use
- Thin cedar shims, sold in packs of 12 for around 400 yen
- A flashlight and a small mirror if you are working from underneath
- Wood filler that matches the tread color
Fixing the Tread From Underneath
If the staircase has an open underside, such as a basement stairwell or an exterior stair with an accessible back, this is the cleaner repair. Have someone stand on the tread and rock their weight slowly while you watch from below to spot exactly where the gap opens between the tread and the stringer or riser. Squeeze wood glue into that gap, tap a cedar shim in until it is snug, then drive two or three 65mm screws up through the shim and into the tread at a slight angle. On a typical staircase with 13 to 15 treads, I usually find that only 2 or 3 need this treatment at any given time, so a full inspection rarely takes more than 30 minutes.
Fixing the Tread From Above
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Most of my properties do not have open access underneath the stairs, so I fix from the top more often than not. First, vacuum the area and locate the gap by pressing along the edges of the tread with your palm. Drill a pilot hole through the tread into the stringer below at roughly a 45 degree angle, about 20mm in from each edge, then drive a 65mm screw through the pilot hole and countersink the head slightly below the surface. Fill the small hole with wood filler, let it cure for about two hours, and sand it flush. Done this way, a single tread costs me under 1,500 yen in materials and the repair is invisible once the filler is sanded and matched to the finish.
When It Is More Than a Loose Screw
Occasionally what looks like a loose tread is actually rot or a cracked stringer, especially on exterior stairs that see rain directly. If you push on the tread and feel real flex, or the wood underneath is soft and dark when you probe it with a screwdriver, stop and get a contractor to look at it. I have had this happen once, on an exterior staircase at a property near the coast, and replacing the stringer section ran about 45,000 yen versus the 1,500 yen I would have spent on a normal screw-and-glue fix. That gap in cost is exactly why I inspect every staircase on my properties twice a year rather than waiting for a complaint.
Keeping Treads From Coming Loose Again
Once a tread is fixed properly with screws and glue rather than just nails, it tends to stay solid for years. I still walk every staircase on all 9 properties each spring and each autumn, checking for movement by hand rather than just listening for a creak, since a tread can loosen before it makes any noise at all. A five minute check twice a year has saved me from at least three late-night tenant calls since I started doing it.
That is the approach I use across all 9 of my properties, and it turns a job that sounds intimidating into a 45 minute fix most landlords can handle themselves.
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