Project 04 · Structural repair

The wobbly chair rescue: glue, not screws

Published Aug 31, 2026 · 8 min read

A wooden chair held tight with cord while its glued joints dry

Screws split the wood and hold for a month; a cleaned, glued, clamped joint holds for decades.

The wobbly chair is the most common rescue in the world and the most commonly ruined. The instinct — drive a screw through the loose joint — is exactly wrong: it splits the wood, holds for a month and makes the proper repair harder. This project is the proper repair: taking the joint apart, cleaning it, gluing it right and clamping it with things you already own. A chair done this way stays fixed for decades, which is longer than most new chairs last.

Why chairs come loose

A wooden chair is a set of round tenons (the ends of stretchers and legs) glued into round holes. Every time someone tips back, the joint flexes a hair; over years the glue crystallises and lets go, and the tenon polishes the inside of the hole until it spins freely. Two facts follow. First, old glue does not re-stick: new glue on top of old, dried glue bonds to the glue, not the wood, and fails again. Second, the fix is mechanical as much as chemical — the joint has to be clean and tight before the glue goes in.

Step one: take it apart, but only as far as it wants to go

Work every joint gently by hand. Loose ones come apart with a twist and a pull; stubborn ones get a few taps with a rubber mallet against a wood block, never a metal hammer. Do not force a tight joint apart — if it is still holding, leave it; you are only rebuilding the ones that failed. Label each part with masking tape as it comes off (front left leg, rear stretcher) because identical-looking parts are not identical, and lay them out in order on the bench.

The tape trick. Before disassembly, wrap a strip of masking tape around each joint and cut it along the seam. When you reassemble, the two halves of the tape line up only in the correct orientation — which spares you the classic hour of "why does the seat sit crooked now". Cheap, fast, and it works on stretchers that look symmetrical but are not.

Chair parts laid out on a bench, each labelled with masking tape — Labelled and laid out in order: the chair, exploded, ready to go back the only right way.

Step two: clean the joint to bare wood

Scrape old glue off the tenon with a knife blade held square, then sand lightly with 120 grit; clean the hole with a strip of sandpaper wrapped around a dowel or a small round file. You want bare, slightly roughened wood on both surfaces. Wipe away dust. If a tenon now slides in loosely — it happens, the hole is worn — do not reach for more glue: glue does not fill gaps. Wrap the tenon in a single layer of cotton thread or a thin shaving of wood veneer soaked in glue, or use a proper gap-filling adhesive rated for wood. A tenon should push in with firm hand pressure and no play.

Step three: the glue that actually holds

Ordinary yellow wood glue (PVA) is the right answer for almost every chair: strong, cheap, cleans up with water and gives you fifteen minutes to fit everything before it grabs. Hide glue is what the chair was probably built with and is the choice if you want the joint reversible for the next century; it is fussier to use. Epoxy is for genuinely broken wood, not loose joints. Skip polyurethane "foaming" glues on chairs: they expand into gaps but the foam has little strength, and they stain everything. Apply glue to both hole and tenon, thinly and completely; wipe the squeeze-out with a damp rag before it dries so it does not show under the finish.

Step four: clamping with no clamps

A chair needs to be pulled tight in several directions at once while the glue sets, and most homes own zero bar clamps. The bench trick: a rope tourniquet. Loop a length of cord around the legs at stretcher height, tie it loosely, slide a stick into the loop and twist until the joints close, then jam the stick against a leg to hold the twist. Pad the corners with cardboard so the cord does not dent the wood. A ratchet strap does the same job faster. Then sit the chair on a flat floor, press down on the seat to seat every joint, check for rock, and leave it a full day — not an hour — before anyone sits on it.

A rope tourniquet with a stick twisted tight around the legs of a glued chair — The rope tourniquet: every joint pulled tight at once, with cord, a stick and cardboard corners.

Questions from the bench

Just one joint is loose. Do I really have to take more apart?

Usually no — repair the one that moves. But test the neighbours firmly first, because a chair that has let go at one joint is often loosening at two more, and re-gluing them now while the glue is out is cheaper than a second session in six months. If they hold under a hard twist, leave them.

The leg is cracked, not loose. Same method?

Different one. A clean lengthwise crack can be worked open slightly, filled with wood glue forced in with a thin blade, and clamped shut; it will be stronger than before along that line. A crack across the grain, or a leg broken through, needs a dowel or splint and is the point where a chair becomes a project for someone with more tools — or an honest candidate for the parts pile.

Can I refinish the chair at the same time?

Yes, and in this order: repair and glue first, wait a day, then strip or sand, then finish. Gluing after finishing means glue on the finish and finish in the joints, both of which weaken the result. The one exception is paint on a chair that only needs a scuff — you can paint fully assembled once the glue has cured.

Chair solid again — now the finish that hides the most sins: painting without brush marks.