# Crowning

**A board whose centre sits higher than its edges — the inverse of cupping.**

Crowning is the other half of the same failure. It commonly appears after a cupped floor has been sanded flat too early: the high edges are removed while the board is still swollen, and when it equalises the centre is left proud.

Like cupping, it is permanent in the sense that matters — the material removed to correct it is gone.

## Related terms

- [Cupping](https://ecowoods.ca/glossary/cupping)
- [Moisture differential](https://ecowoods.ca/glossary/moisture-differential)
- [Belt floor sander](https://ecowoods.ca/glossary/belt-sander)


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## Provenance

- Canonical URL: https://ecowoods.ca/glossary/crowning
- Publisher: Ecowoods Inc., Toronto & the GTA
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- Defined in: https://ecowoods.ca/papers/toronto-hardwood-climate-moisture-protocol#failure-modes
- Citation guide: https://ecowoods.ca/ai.txt

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