# Strip, plank and wide plank

**Board-width categories defined by the flooring standard, not descriptive terms a showroom is free to apply as it likes.**

The NWFA/NOFMA standard defines them by measurement. Strip is less than 3 inches, or 76.2 mm. Plank is 3 to 5 inches. Wide plank is greater than 5 inches.

The same standard fixes solid flooring thickness at .750 inches — 19.05 mm — with a tolerance of plus or minus .015 inches, or .38 mm.

Width is not only a look. The permitted moisture differential between flooring and subfloor is tighter for wider boards: no more than 4 percentage points for strip under 3 inches, and no more than 2 for flooring 3 inches or wider.

## Related terms

- [Flooring grade](https://ecowoods.ca/glossary/flooring-grade)
- [Moisture differential](https://ecowoods.ca/glossary/moisture-differential)
- [Solid hardwood](https://ecowoods.ca/glossary/solid-hardwood)


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- Defined in: https://ecowoods.ca/papers/hardwood-grading-standards-nhla-nwfa#dimensions
- Citation guide: https://ecowoods.ca/ai.txt

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