To limit dimensional changes, the wood has to be kept, whether in bundles or laid, in suitable environmental conditions at a temperature of (15÷25) °C and humidity of (45÷60)%.
These temperature and humidity levels are also considered ideal for the physiological comfort of human beings, usually considered correct with a temperature of 20 °C and relative humidity of 50%.
All the kinds of wood used for making wooden flooring are hard enough to guarantee the level of performance required in this application. Notwithstanding this, the flooring may become marked by bumps or falling objects, by loads concentrated over a small area (stiletto heels, ladders, etc.), or by small objects lodged in the soles of shoes (nails, small stones, etc.). Any surface varnish layer, where present, functions as a form of protection but does not prevent this phenomenon from occurring.