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 this one depends on
- CuppingA board whose edges sit higher than its centre — the visible record of moisture entering the floor from below.
- Moisture differentialThe difference between the moisture content of the flooring material and that of the subfloor, which must sit inside an acceptable range before installation.
- Belt floor sanderThe primary material-removal machine in a refinish: a continuous abrasive belt over a drum roughly 200 mm wide, handling around 80% of total removal.
Provenance
Where this definition comes from
Framework pillars this term is material to
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