An important aspect of choosing the right wood flooring for a home lies in the Janka Hardness Scale – the scale that determines the hardness of a particular type of wood over another. The scale was invented in 1906 by Gabriel Janka, an Austrian wood researcher, and standardized in 1927 by the American Society for Testing and Materials (ASTM).
Depending on the room where the flooring will be installed, a certain level of hardness may make it a more desirable choice. Generally speaking, the higher the number on the scale, the harder and more scratch resistant a wood is. The harder a wood is, the more difficult it becomes to saw or run through a mill. Surprisingly enough, though, this does not impact price for flooring. Flooring prices are dictated by how readily available the species of wood is, rather than how hard it is.