Relative Hardness of Selected Wood Flooring Species
(Ranked by Janka hardness rating)
The Janka (or side) hardness test measures the force required to embed a .444-inch steel ball to half its diameter in wood. It is one of the best measures of the ability of a wood species to withstand denting and wear. By the same token, it also is a good indicator of how hard or easy a species is to saw or nail. Northern red oak, for example, has a Janka hardness rating of 1290. Spotted gum, with a rating of 2473, is nearly twice as hard. If you’re accustomed to working with red oak and decide to tackle a job with spotted gum, you can expect it to be much harder to cut and nail. A rating is not included for bamboo, as bamboo flooring varies greatly between different manufacturers’ products and between vertical and horizontal construction. Likewise, a rating is not included for cork flooring.
While Janka values give a general sense of hardness, many other factors also contribute to a wood floor’s durability, including the type of cut (i.e. plainsawn, quartersawn), denseness of cell structure, and finish used.
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