Symptoms
- Visible crack line across the seat
- Seat flexes or creaks when sitting
- Crack widens gradually over time
Likely causes
- CommonWood grain stress from repeated weight-bearing useSolid wood seats naturally develop stress cracks along the grain over years.
- CommonDried out wood losing flexibilityWood that dries out over time becomes more brittle and prone to cracking.
- PossibleImpact or excessive weight beyond the chair's ratingA hard sit-down or overloading can crack a seat suddenly.
What to do
- Stop using the chair until repaired if the crack is significant, to avoid it fully splitting.
- Flip the chair over and clean out the crack of any dust or debris.
- Work wood glue into the crack, working it in from both sides if possible.
- Clamp the crack closed and let it cure fully per the glue's instructions, usually 24 hours.
- For extra strength, screw a wood or metal brace across the crack on the underside where it won't be seen.
- Sand and touch up the top surface finish if any glue squeezed out or the crack is visible from above.
Tools and parts
- Wood glue
- Clamps
- Wood brace or plate
- Sandpaper
Wood glueSearch: “wood furniture glue”
Chair seat repair braceSearch: “wood chair seat reinforcement brace”
When to call a pro
For a valuable or antique chair, a furniture restorer can repair the crack while preserving the original finish and appearance.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.